plum vs genus Prunus

plum and genus Prunus both are nouns.

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

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