congress vs legislature

congress and legislature both are nouns.

Word	Noun	Adjective	Verb	Adverb
congress	Yes	No	No	No
legislature	Yes	No	No	No

As nouns, legislature is a hypernym of congress; that is, legislature is a word with a broader meaning than congress:

Other hypernyms of congress include general assembly, law-makers, legislative assembly, legislative body.

congress (noun)	legislature (noun)
the social act of assembling for some common purpose	persons who make or amend or repeal laws
a meeting of elected or appointed representatives
a national legislative assembly