cultivar vs vascular plant

cultivar and vascular plant both are nouns.

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

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

cultivar: a variety of a plant developed from a natural species and maintained under cultivation
vascular plant: green plant having a vascular system: ferns, gymnosperms, angiosperms

Other hypernyms of cultivar include variety, tracheophyte.

cultivar (noun)	vascular plant (noun)
a variety of a plant developed from a natural species and maintained under cultivation	green plant having a vascular system: ferns, gymnosperms, angiosperms