pteridosperm vs gymnosperm

pteridosperm and gymnosperm both are nouns.

Word	Noun	Adjective	Verb	Adverb
pteridosperm	Yes	No	No	No
gymnosperm	Yes	No	No	No

As nouns, gymnosperm is a hypernym of pteridosperm; that is, gymnosperm is a word with a broader meaning than pteridosperm:

pteridosperm: an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)
gymnosperm: plants of the class Gymnospermae having seeds not enclosed in an ovary

pteridosperm (noun)	gymnosperm (noun)
an extinct seed-producing fernlike plant of the order Cycadofilicales (or group Pteridospermae)	plants of the class Gymnospermae having seeds not enclosed in an ovary