grate vs furnace

grate and furnace both are nouns.

Word	Noun	Adjective	Verb	Adverb
grate	Yes	No	Yes	No
furnace	Yes	No	No	No

grate (noun)	furnace (noun)
a frame of iron bars to hold a fire	an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.
a barrier that has parallel or crossed bars blocking a passage but admitting air
a harsh rasping sound made by scraping something

grate (verb)	furnace (verb)
make a grating or grinding sound by rubbing together
scratch repeatedly
reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface
gnaw into; make resentful or angry
furnish with a grate