crumb vs fragment

crumb and fragment both are nouns.

Word	Noun	Adjective	Verb	Adverb
crumb	Yes	No	Yes	No
fragment	Yes	No	Yes	No

As verbs, fragment is a hypernym of crumb; that is, fragment is a word with a broader meaning than crumb:

Other hypernyms of crumb include break up, fragmentise, fragmentize.

crumb (noun)	fragment (noun)
small piece of e.g. bread or cake	a broken piece of a brittle artifact
a person who is deemed to be despicable or contemptible	an incomplete piece
a very small quantity of something	a piece broken off or cut off of something else

crumb (verb)	fragment (verb)
remove crumbs from	break or cause to break into pieces
break into crumbs
coat with bread crumbs