lobefin vs crossopterygian

lobefin and crossopterygian both are nouns.

Word	Noun	Adjective	Verb	Adverb
lobefin	Yes	No	No	No
crossopterygian	Yes	No	No	No

As nouns, lobefin and crossopterygian are synonyms defined as:

lobefin and crossopterygian: any fish of the order Crossopterygii; most known only in fossil form

Other synonyms of lobefin include lobe-finned fish.

lobefin (noun)	crossopterygian (noun)
any fish of the order Crossopterygii; most known only in fossil form	any fish of the order Crossopterygii; most known only in fossil form