morsel vs crumb

morsel and crumb both are nouns.

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

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

Other hyponyms of morsel include chaw, chew, cud, plug, quid, wad, sop, sops.

morsel (noun)	crumb (noun)
a small amount of solid food; a mouthful	small piece of e.g. bread or cake
a small quantity of anything	a person who is deemed to be despicable or contemptible
	a very small quantity of something