conjunction

used to introduce a phrase or clause contrasting with what has already been mentioned.

he stumbled but didn’t fall

yet,nevertheless,nonetheless,even so,however,still,notwithstanding,despite that,in spite of that,for all that,all the same,just the same,at the same time,be that as it may,though,although,still and all,withal,natheless,howbeit

preposition

except; apart from; other than.

we were never anything but poor

except (for),apart from,other than,besides,aside from,with the exception of,short of,bar,barring,excepting,excluding,omitting,leaving out,save (for),saving,outside of

adverb

no more than; only.

he is but a shadow of his former self

only,just,simply,merely,no more than,nothing but,a mere,nobbut

noun

an argument against something; an objection.

no buts —just get out of here