fume vs give off

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

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

As verbs, give off is a hypernym of fume; that is, give off is a word with a broader meaning than fume:

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

Other hypernyms of fume include emit, give out.

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

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