conifer vs gymnospermous tree

conifer and gymnospermous tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
conifer	Yes	No	No	No
gymnospermous tree	Yes	No	No	No

As nouns, gymnospermous tree is a hypernym of conifer; that is, gymnospermous tree is a word with a broader meaning than conifer:

conifer (noun)	gymnospermous tree (noun)
any gymnospermous tree or shrub bearing cones	any tree of the division Gymnospermophyta