genus Pernis vs Pernis

genus Pernis and Pernis both are nouns.

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

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

genus Pernis and Pernis: a common European bird of prey; dull brown with white-streaked underparts

genus Pernis (noun)	Pernis (noun)
a common European bird of prey; dull brown with white-streaked underparts	a common European bird of prey; dull brown with white-streaked underparts