calk vs furnish

calk is a noun but furnish is not a noun.

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

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

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

calk (noun)	furnish (noun)
a metal cleat on the bottom front of a horseshoe to prevent slipping

calk (verb)	furnish (verb)
injure with a calk	give something useful or necessary to
seal with caulking	provide or equip with furniture
provide with calks