settee vs couch

settee and couch both are nouns.

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

As nouns, couch is a hypernym of settee; that is, couch is a word with a broader meaning than settee:

Other hypernyms of settee include lounge, sofa.

settee (noun)	couch (noun)
a small sofa	an upholstered seat for more than one person
a long wooden bench with a back	a narrow bed on which a patient lies during psychiatric or psychoanalytic treatment
	a flat coat of paint or varnish used by artists as a primer

settee (verb)	couch (verb)
	formulate in a particular style or language