family Rosaceae vs Prunus

family Rosaceae and Prunus both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Rosaceae	Yes	No	No	No
Prunus	Yes	No	No	No

family Rosaceae (noun)	Prunus (noun)
a large family of dicotyledonous plants of order Rosales; have alternate leaves and five-petaled flowers with numerous stamens	a genus of shrubs and trees of the family Rosaceae that is widely distributed in temperate regions