bedevil vs bug

bedevil is not a noun while bug is a noun.

Word	Noun	Adjective	Verb	Adverb
bedevil	No	No	Yes	No
bug	Yes	No	Yes	No

As verbs, bug is a hyponym of bedevil; that is, bug is a word with a more specific, narrower meaning than bedevil:

Other hyponyms of bedevil include madden, hamstring, badger, beleaguer, pester, tease, oppress, persecute.

bedevil (noun)	bug (noun)
	insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis
	general term for any insect or similar creeping or crawling invertebrate
	a minute life form (especially a disease-causing bacterium); the term is not in technical use
	a small hidden microphone; for listening secretly
	a fault or defect in a computer program, system, or machine

bedevil (verb)	bug (verb)
be confusing or perplexing to; cause to be unable to think clearly	annoy persistently
treat cruelly	tap a telephone or telegraph wire to get information