humpback vs genus Megaptera

humpback and genus Megaptera both are nouns.

Word	Noun	Adjective	Verb	Adverb
humpback	Yes	No	No	No
genus Megaptera	Yes	No	No	No

humpback (noun)	genus Megaptera (noun)
large whalebone whale with long flippers noted for arching or humping its back as it dives	humpback whales
a person whose back is hunched because of abnormal curvature of the upper spine
an abnormal backward curve to the vertebral column