couch vs love seat

couch and love seat both are nouns.

Word	Noun	Adjective	Verb	Adverb
couch	Yes	No	Yes	No
love seat	Yes	No	No	No

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

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

couch (noun)	love seat (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 flat coat of paint or varnish used by artists as a primer

couch (verb)	love seat (verb)
formulate in a particular style or language