cherry plum vs plum

cherry plum and plum both are nouns.

Word	Noun	Adjective	Verb	Adverb
cherry plum	Yes	No	No	No
plum	Yes	No	No	Yes

As nouns, plum is a hypernym of cherry plum; that is, plum is a word with a broader meaning than cherry plum:

cherry plum: an edible fruit of the small tree Prunus cerasifera.
plum: any of numerous varieties of small to medium-sized round or oval fruit having a smooth skin and a single pit

As nouns, plum is a hypernym of cherry plum; that is, plum is a word with a broader meaning than cherry plum:

cherry plum: small Asiatic tree bearing edible red or yellow fruit
plum: any of several trees producing edible oval fruit having a smooth skin and a single hard stone

Other hypernyms of cherry plum include plum tree.

cherry plum (noun)	plum (noun)
an edible fruit of the small tree Prunus cerasifera.	a highly desirable position or assignment
small Asiatic tree bearing edible red or yellow fruit	any of numerous varieties of small to medium-sized round or oval fruit having a smooth skin and a single pit
	any of several trees producing edible oval fruit having a smooth skin and a single hard stone

cherry plum (adverb)	plum (adverb)
	exactly
	completely; used as intensifiers