plum vs Prunus

plum and Prunus both are nouns.

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

plum (noun)	Prunus (noun)
a highly desirable position or assignment	a genus of shrubs and trees of the family Rosaceae that is widely distributed in temperate regions
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

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