seed plant vs phanerogam

seed plant and phanerogam both are nouns.

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

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

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

Other synonyms of seed plant include spermatophyte.

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