I love words.
Here’s the difference between the Oxford ‘British English’ Dictionary entry for the word antithetical* and Oxford’s ‘US English’ entry (arrowed):

antithetical_ definition of antithetical in Oxford dictionary (British & World English)-1

Oxford British & World English

American English

Oxford American English

Quirky!

Of course, when I think about it, a word like ‘syllabification‘ simply had to exist — but I’d not encountered it. (Perhaps I’ve led a sheltered life.)

– P

* a word I used, unselfconsciously and without definition, in a post last night about the irrepressible urge to ‘share’ (i.e. break) confidences: Sharing secrets? Isn’t that kinda antithetical?