rafter vs furnish

rafter is a noun but furnish is not a noun.

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

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

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

rafter (noun)	furnish (noun)
one of several parallel sloping beams that support a roof
someone who travels by raft

rafter (verb)	furnish (verb)
provide (a ceiling) with rafters	give something useful or necessary to
	provide or equip with furniture