Latimeria chalumnae vs lobefin

Latimeria chalumnae and lobefin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Latimeria chalumnae	Yes	No	No	No
lobefin	Yes	No	No	No

As nouns, lobefin is a hypernym of Latimeria chalumnae; that is, lobefin is a word with a broader meaning than Latimeria chalumnae:

Latimeria chalumnae: fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa
lobefin: any fish of the order Crossopterygii; most known only in fossil form

Other hypernyms of Latimeria chalumnae include crossopterygian, lobe-finned fish.

Latimeria chalumnae (noun)	lobefin (noun)
fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa	any fish of the order Crossopterygii; most known only in fossil form