genus Progne vs purple martin

genus Progne and purple martin both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Progne	Yes	No	No	No
purple martin	Yes	No	No	No

genus Progne (noun)	purple martin (noun)
a genus of Hirundinidae containing nine American swallows, the purple martin, the Caribbean martin, the Cuban martin, the Sinaloa martin, the grey-breasted martin, the Galapagos martin, the Peruvian martin, the Southern martin, and the brown-chested martin (Progne)	large North American martin of which the male is blue-black