congress vs legislative body

congress and legislative body both are nouns.

Word	Noun	Adjective	Verb	Adverb
congress	Yes	No	No	No
legislative body	Yes	No	No	No

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

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

congress (noun)	legislative body (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