Synonyms of sooner in English:

sooner


See UK English definition of soon

adverb

1‘he should have done it sooner’

SYNONYMS
earlier, before, beforehand, in advance, in readiness, ahead of time, already

2‘I would sooner stay’

SYNONYMS
rather, by preference, preferably, by choice, from choice, more willingly, more readily
North American if I had my druthers