gaffe vs solecism

gaffe and solecism both are nouns.

Word	Noun	Adjective	Verb	Adverb
gaffe	Yes	No	No	No
solecism	Yes	No	No	No

As nouns, gaffe and solecism are synonyms defined as:

Other synonyms of gaffe include faux pas, gaucherie, slip.

gaffe (noun)	solecism (noun)
a socially awkward or tactless act	a socially awkward or tactless act