couch vs tete-a-tete

couch and tete-a-tete both are nouns.

Word	Noun	Adjective	Verb	Adverb
couch	Yes	No	Yes	No
tete-a-tete	Yes	Yes	No	No

As nouns, tete-a-tete is a hyponym of couch; that is, tete-a-tete is a word with a more specific, narrower meaning than couch:

Other hyponyms of couch include convertible, sofa bed, daybed, divan bed, divan, love seat, loveseat, vis-a-vis, settee, squab.

couch (noun)	tete-a-tete (noun)
an upholstered seat for more than one person	small sofa that seats two people
a narrow bed on which a patient lies during psychiatric or psychoanalytic treatment	a private conversation between two people
a flat coat of paint or varnish used by artists as a primer

couch (adjective)	tete-a-tete (adjective)
	involving two persons; intimately private

couch (verb)	tete-a-tete (verb)
formulate in a particular style or language