Fulmarus glacialis vs petrel

Fulmarus glacialis and petrel both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fulmarus glacialis	Yes	No	No	No
petrel	Yes	No	No	No

As nouns, petrel is a hypernym of Fulmarus glacialis; that is, petrel is a word with a broader meaning than Fulmarus glacialis:

Fulmarus glacialis: heavy short-tailed oceanic bird of polar regions
petrel: relatively small long-winged tube-nosed bird that flies far from land

Fulmarus glacialis (noun)	petrel (noun)
heavy short-tailed oceanic bird of polar regions	relatively small long-winged tube-nosed bird that flies far from land