orchid family vs genus Pleurothallis

orchid family and genus Pleurothallis both are nouns.

Word	Noun	Adjective	Verb	Adverb
orchid family	Yes	No	No	No
genus Pleurothallis	Yes	No	No	No

orchid family (noun)	genus Pleurothallis (noun)
enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers	large genus of epiphytic or lithophytic orchids of tropical America