genus Carya vs Carya

genus Carya and Carya both are nouns.

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

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

genus Carya and Carya: genus of large deciduous nut-bearing trees; United States and China

genus Carya (noun)	Carya (noun)
genus of large deciduous nut-bearing trees; United States and China	genus of large deciduous nut-bearing trees; United States and China