genus Clethra vs Clethra

genus Clethra and Clethra both are nouns.

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

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

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

genus Clethra (noun)	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