English usage changes over time and around the world, when in doubt we check trends using Google books Ngram Viewer
However we have noticed some regular anomalies, listed below.
adaption ≈ adaptation
analog ≈ analogue
catalog ≈ catalogue
center ≈ centre
color ≈ colour
disc ≈ disk
fulfill ≈ fulfil
gram ≈ gramme
install ≈ instal
licence ≈ license
metre for distance or meter for instrument
normalize, normalization ≈ normalise, normalisation
omni-directional ≈ omnidirectional
polarize ≈ polarise
program ≈ programme
standardize, standardization ≈ standardise, standardisation