baa-lamb vs lamb

baa-lamb and lamb both are nouns.

Word	Noun	Adjective	Verb	Adverb
baa-lamb	Yes	No	No	No
lamb	Yes	No	Yes	No

As nouns, lamb is a hypernym of baa-lamb; that is, lamb is a word with a broader meaning than baa-lamb:

baa-lamb (noun)	lamb (noun)
child's word for a sheep or lamb	young sheep
	the flesh of a young domestic sheep eaten as food
	a sweet innocent mild-mannered person (especially a child)
	a person easily deceived or cheated (especially in financial matters)

baa-lamb (verb)	lamb (verb)
	give birth to a lamb