words like “yah”

oui - yes (obviously you know this one)
ouais - yeah
ouaip - yep
eh oui - guess so
mais oui - sure
si! - yes, on the contrary
words of acceptance

d'accord - alright, ok
je ne dis pas non - I don’t say no
words like “yes, certainly”

certainement - certainly 8D
tout à fait - absolutely
bien sûr que oui - of course

volontiers - with pleasure