As verbs the difference between sympathise and emphasise
is that sympathise is standard spelling of from=non-Oxford British spelling|sympathize|lang=en while emphasise is british an alternative spelling of emphasize.
emphasise
English
Verb
(emphasis)
(British)
Usage notes
The "s" spelling has co-existed with the "z" spelling for at least 150 years (Thackeray wrote
emphasised ), and is becoming more common in the UK, with the "z" spelling gradually falling out of usage.
British English forms