grub vs cadge

grub is a noun but cadge is not a noun.

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

As verbs, grub and cadge are synonyms defined as:

Other synonyms of grub include bum, mooch, sponge.

grub (noun)	cadge (noun)
a soft thick wormlike larva of certain beetles and other insects
informal terms for a meal

grub (verb)	cadge (verb)
search about busily	ask for and get free; be a parasite
ask for and get free; be a parasite	obtain or seek to obtain by cadging or wheedling