Comment by spider-mario

It would be a good habit to check (for example on the Wiktionary – I have a Chrome search keyword dedicated to that) because those are not the only differences.

fulfill vs. fulfil

judgment vs. judgement

disk vs. disc (https://en.wiktionary.org/wiki/disk#Usage_notes)

hiccup vs. hiccough

diarrhea vs. diarrhoea