give off vs fume

give off is not a noun while fume is a noun.

Word	Noun	Adjective	Verb	Adverb
give off	No	No	Yes	No
fume	Yes	No	Yes	No

As verbs, fume is a hyponym of give off; that is, fume is a word with a more specific, narrower meaning than give off:

give off: give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
fume: emit a cloud of fine particles

Other hyponyms of give off include effuse, reflect, shine, spark, sparkle, radiate, scintillate, smoke, reek, shoot, ray, steam.

give off (noun)	fume (noun)
	a cloud of fine particles suspended in a gas

give off (verb)	fume (verb)
have as a by-product	be wet with sweat or blood, as of one's face
give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.	be mad, angry, or furious
	treat with fumes, expose to fumes, especially with the aim of disinfecting or eradicating pests
	emit a cloud of fine particles