spermatophyte vs seed plant

spermatophyte and seed plant both are nouns.

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

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

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

Other synonyms of spermatophyte include phanerogam.

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