satire vs caustic remark

satire and caustic remark both are nouns.

Word	Noun	Adjective	Verb	Adverb
satire	Yes	No	No	No
caustic remark	Yes	No	No	No

As nouns, satire and caustic remark are synonyms defined as:

satire and caustic remark: witty language used to convey insults or scorn

Other synonyms of satire include irony, sarcasm.

satire (noun)	caustic remark (noun)
witty language used to convey insults or scorn	witty language used to convey insults or scorn
a genre of literature and performing arts, in which shortcomings are held up to ridicule, ideally with the intent of shaming others