psilophyton vs vascular plant

psilophyton and vascular plant both are nouns.

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

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

psilophyton: any plant or fossil of the genus Psilophyton
vascular plant: green plant having a vascular system: ferns, gymnosperms, angiosperms

Other hypernyms of psilophyton include tracheophyte.

psilophyton (noun)	vascular plant (noun)
any plant or fossil of the genus Psilophyton	green plant having a vascular system: ferns, gymnosperms, angiosperms