grub vs maggot

grub and maggot both are nouns.

Word	Noun	Adjective	Verb	Adverb
grub	Yes	No	Yes	No
maggot	Yes	No	No	No

As nouns, maggot is a hyponym of grub; that is, maggot is a word with a more specific, narrower meaning than grub:

grub: a soft thick wormlike larva of certain beetles and other insects
maggot: the larva of the housefly and blowfly commonly found in decaying organic matter

Other hyponyms of grub include leatherjacket.

grub (noun)	maggot (noun)
a soft thick wormlike larva of certain beetles and other insects	the larva of the housefly and blowfly commonly found in decaying organic matter
informal terms for a meal

grub (verb)	maggot (verb)
search about busily
ask for and get free; be a parasite