headline vs furnish

headline is a noun but furnish is not a noun.

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

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

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

headline (noun)	furnish (noun)
the heading or caption of a newspaper article

headline (verb)	furnish (verb)
publicize widely or highly, as if with a headline	give something useful or necessary to
provide (a newspaper page or a story) with a headline	provide or equip with furniture