diff --git a/codespell_lib/data/dictionary_en-GB_to_en-US.txt b/codespell_lib/data/dictionary_en-GB_to_en-US.txt
index 07b06211d0..7dcbb8e7a9 100644
--- a/codespell_lib/data/dictionary_en-GB_to_en-US.txt
+++ b/codespell_lib/data/dictionary_en-GB_to_en-US.txt
@@ -10,6 +10,8 @@ analysed->analyzed
 analyser->analyzer
 analysers->analyzers
 analysing->analyzing
+apologise->apologize
+armour->armor
 artefact->artifact
 artefacts->artifacts
 authorisation->authorization
@@ -17,7 +19,12 @@ authorise->authorize
 authorised->authorized
 authorises->authorizes
 authorising->authorizing
+bastardise->bastardize
+bastardised->bastardized
+bastardises->bastardizes
+bastardising->bastardizing
 behaviour->behavior
+behavioural->behavioral
 behaviours->behaviors
 cancelled->canceled
 cancelling->canceling
@@ -28,6 +35,9 @@ capitalises->capitalizes
 capitalising->capitalizing
 catalogue->catalog
 catalogues->catalogs
+categorise->categorize
+categorised->categorized
+categorises->categorizes
 centimetre->centimeter
 centimetres->centimeters
 centralisation->centralization
@@ -36,6 +46,7 @@ centralised->centralized
 centralises->centralizes
 centralising->centralizing
 centre->center
+centred->centered
 centres->centers
 characterisation->characterization
 characterise->characterize
@@ -43,9 +54,11 @@ characterised->characterized
 characterises->characterizes
 characterising->characterizing
 colour->color
+coloured->colored
 colourful->colorful
 colourfully->colorfully
 colouring->coloring
+colourless->colorless
 colours->colors
 counsellor->counselor
 criticise->criticize
@@ -62,7 +75,14 @@ customise->customize
 customised->customized
 customises->customizes
 customising->customizing
+decentralisation->decentralization
+decentralise->decentralize
+decentralised->decentralized
+decentralises->decentralizes
+decentralising->decentralizing
 defence->defense
+defenceless->defenseless
+defences->defenses
 demonise->demonize
 demonised->demonized
 demonises->demonizes
@@ -73,13 +93,27 @@ digitise->digitize
 digitised->digitized
 digitises->digitizes
 digitising->digitizing
+disfavour->disfavor
+economise->economize
 emphasise->emphasize
 emphasised->emphasized
 emphasises->emphasizes
 emphasising->emphasizing
 endeavour->endeavor
+endeavoured->endeavored
+endeavouring->endeavoring
 endeavours->endeavors
+equalisation->equalization
+equalise->equalize
+equalised->equalized
+equaliser->equalizer
+equalisers->equalizers
+equalises->equalizes
+equalising->equalizing
 favour->favor
+favourable->favorable
+favoured->favored
+favouring->favoring
 favourite->favorite
 favourites->favorites
 favouritism->favoritism
@@ -91,6 +125,11 @@ finalises->finalizes
 finalising->finalizing
 flavour->flavor
 flavours->flavors
+formalisation->formalization
+formalise->formalize
+formalised->formalized
+formalises->formalizes
+formalising->formalizing
 fulfil->fulfill
 fulfils->fulfills
 generalisation->generalization
@@ -100,13 +139,32 @@ generalised->generalized
 generalises->generalizes
 generalising->generalizing
 grey->gray
+greyed->grayed
+greyish->grayish
+greys->grays
 honour->honor
+honoured->honored
+honouring->honoring
 honours->honors
+humour->humor
+hypothesise->hypothesize
+hypothesised->hypothesized
+hypothesises->hypothesizes
+hypothesising->hypothesizing
 initialisation->initialization
 initialise->initialize
 initialised->initialized
 initialises->initializes
 initialising->initializing
+internationalisation->internationalization
+internationalise->internationalize
+internationalised->internationalized
+internationalises->internationalizes
+internationalising->internationalizing
+italicise->italicize
+italicised->italicized
+italicises->italicizes
+italicising->italicizing
 judgement->judgment
 judgements->judgments
 kilometre->kilometer
@@ -114,6 +172,8 @@ kilometres->kilometers
 labelled->labeled
 labelling->labeling
 labour->labor
+laboured->labored
+labours->labors
 legalisation->legalization
 legalise->legalize
 legalised->legalized
@@ -121,8 +181,21 @@ legalises->legalizes
 legalising->legalizing
 licence->license
 licences->licenses
+litre->liter
+litres->liters
+localise->localize
+localised->localized
+localises->localizes
+localising->localizing
 manoeuvre->maneuver
 manoeuvres->maneuvers
+marshalled->marshaled
+marshalling->marshaling
+maximisation->maximization
+maximise->maximize
+maximised->maximized
+maximises->maximizes
+maximising->maximizing
 memorisation->memorization
 memorise->memorize
 memorised->memorized
@@ -140,6 +213,10 @@ minimising->minimizing
 mitre->miter
 modelled->modeled
 modelling->modeling
+modernise->modernize
+modernised->modernized
+modernises->modernizes
+modernising->modernizing
 mould->mold
 moulds->molds
 nasalisation->nasalization
@@ -159,6 +236,7 @@ optimiser->optimizer
 optimises->optimizes
 optimising->optimizing
 organisation->organization
+organisational->organizational
 organisations->organizations
 organise->organize
 organised->organized
@@ -166,6 +244,10 @@ organiser->organizer
 organisers->organizers
 organises->organizes
 organising->organizing
+penalise->penalize
+penalised->penalized
+penalises->penalizes
+penalising->penalizing
 plagiarise->plagiarize
 plagiarised->plagiarized
 plagiarises->plagiarizes
@@ -175,6 +257,8 @@ polarised->polarized
 polarises->polarizes
 polarising->polarizing
 practise->practice
+pretence->pretense
+pretences->pretenses
 prioritisation->prioritization
 prioritise->prioritize
 prioritised->prioritized
@@ -184,6 +268,10 @@ publicise->publicize
 publicised->publicized
 publicises->publicizes
 publicising->publicizing
+randomise->randomize
+randomised->randomized
+randomises->randomizes
+randomising->randomizing
 realisation->realization
 realise->realize
 realised->realized
@@ -205,16 +293,20 @@ reorganise->reorganize
 reorganised->reorganized
 reorganises->reorganizes
 reorganising->reorganizing
+rigour->rigor
 sanitise->sanitize
 sanitised->sanitized
 sanitiser->sanitizer
 sanitises->sanitizes
 sanitising->sanitizing
+sceptical->skeptical
 serialisation->serialization
 serialise->serialize
 serialised->serialized
 serialises->serializes
 serialising->serializing
+signalled->signaled
+signalling->signaling
 skilful->skillful
 skilfully->skillfully
 skilfulness->skillfulness
@@ -241,6 +333,10 @@ summarise->summarize
 summarised->summarized
 summarises->summarizes
 summarising->summarizing
+symbolise->symbolize
+symbolised->symbolized
+symbolises->symbolizes
+symbolising->symbolizing
 synchronisation->synchronization
 synchronise->synchronize
 synchronised->synchronized
@@ -249,8 +345,12 @@ synchronising->synchronizing
 totalled->totaled
 totalling->totaling
 unauthorised->unauthorized
+unfavourable->unfavorable
+unfavourably->unfavorably
 unorganised->unorganized
+unrecognisable->unrecognizable
 unrecognised->unrecognized
+utilisable->utilizable
 utilisation->utilization
 utilise->utilize
 utilised->utilized