seed plant vs spermatophyte

seed plant and spermatophyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
seed plant	Yes	No	No	No
spermatophyte	Yes	No	No	No

As nouns, seed plant and spermatophyte are synonyms defined as:

seed plant and spermatophyte: plant that reproduces by means of seeds not spores

Other synonyms of seed plant include phanerogam.

seed plant (noun)	spermatophyte (noun)
plant that reproduces by means of seeds not spores	plant that reproduces by means of seeds not spores