divan vs couch

divan and couch both are nouns.

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

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

Other hypernyms of divan include lounge, sofa.

divan (noun)	couch (noun)
a long backless sofa (usually with pillows against a wall)	an upholstered seat for more than one person
a Muslim council chamber or law court	a narrow bed on which a patient lies during psychiatric or psychoanalytic treatment
a collection of Persian or Arabic poems (usually by one author)	a flat coat of paint or varnish used by artists as a primer
a Muslim council of state

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