curtain vs furnish

curtain is a noun but furnish is not a noun.

Word	Noun	Adjective	Verb	Adverb
curtain	Yes	No	Yes	No
furnish	No	No	Yes	No

As verbs, furnish is a hypernym of curtain; that is, furnish is a word with a broader meaning than curtain:

Other hypernyms of curtain include offer, provide, render, supply.

curtain (noun)	furnish (noun)
hanging cloth used as a blind (especially for a window)
any barrier to communication or vision

curtain (verb)	furnish (verb)
provide with drapery	give something useful or necessary to
	provide or equip with furniture