U.S. House of Representatives vs United States House of Representatives

U.S. House of Representatives and United States House of Representatives both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S. House of Representatives	Yes	No	No	No
United States House of Representatives	Yes	No	No	No

As nouns, U.S. House of Representatives and United States House of Representatives are synonyms defined as:

U.S. House of Representatives and United States House of Representatives: the lower legislative house of the United States Congress

Other synonyms of U.S. House of Representatives include House of Representatives, U.S. House, US House, US House of Representatives.

U.S. House of Representatives (noun)	United States House of Representatives (noun)
the lower legislative house of the United States Congress	the lower legislative house of the United States Congress