Clethra vs genus Clethra

Clethra and genus Clethra both are nouns.

Word	Noun	Adjective	Verb	Adverb
Clethra	Yes	No	No	No
genus Clethra	Yes	No	No	No

As nouns, Clethra and genus Clethra are synonyms defined as:

Clethra and genus Clethra: type and sole genus of the Clethraceae; deciduous shrubs or small trees: white alder, summer-sweet

Clethra (noun)	genus Clethra (noun)
type and sole genus of the Clethraceae; deciduous shrubs or small trees: white alder, summer-sweet	type and sole genus of the Clethraceae; deciduous shrubs or small trees: white alder, summer-sweet