As nouns the difference between terms and crossopterygian
is that terms is while crossopterygian is (zoology) one of the crossopterygii.
As an adjective crossopterygian is
(zoology) of or pertaining to the crossopterygii.
terms
English
Noun
(head)
Statistics
*
----
crossopterygian
English
Adjective
(-)
(zoology) Of or pertaining to the Crossopterygii.