phanerogam vs vascular plant

phanerogam and vascular plant both are nouns.

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

As nouns, vascular plant is a hypernym of phanerogam; that is, vascular plant is a word with a broader meaning than phanerogam:

phanerogam: plant that reproduces by means of seeds not spores
vascular plant: green plant having a vascular system: ferns, gymnosperms, angiosperms

Other hypernyms of phanerogam include tracheophyte.

phanerogam (noun)	vascular plant (noun)
plant that reproduces by means of seeds not spores	green plant having a vascular system: ferns, gymnosperms, angiosperms