couch vs lounge

couch and lounge both are nouns.

Word	Noun	Adjective	Verb	Adverb
couch	Yes	No	Yes	No
lounge	Yes	No	Yes	No

As nouns, couch and lounge are synonyms defined as:

Other synonyms of couch include sofa.

couch (noun)	lounge (noun)
an upholstered seat for more than one person	a room (as in a hotel or airport) with seating where people can wait
a narrow bed on which a patient lies during psychiatric or psychoanalytic treatment	an upholstered seat for more than one person
a flat coat of paint or varnish used by artists as a primer

couch (verb)	lounge (verb)
formulate in a particular style or language	sit or recline comfortably
	be about a place without any apparent purpose