drupe vs plum

drupe and plum both are nouns.

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

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

drupe: fleshy indehiscent fruit with a single seed: e.g. almond, peach, plum, cherry, elderberry, olive, jujube
plum: any of numerous varieties of small to medium-sized round or oval fruit having a smooth skin and a single pit

Other hyponyms of drupe include almond, peach, cherry, elderberry, Chinese date, Chinese jujube, jujube, olive, drupelet.

drupe (noun)	plum (noun)
fleshy indehiscent fruit with a single seed: e.g. almond, peach, plum, cherry, elderberry, olive, jujube	a highly desirable position or assignment
	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

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