Trifolium reflexum vs trefoil

Trifolium reflexum and trefoil both are nouns.

Word	Noun	Adjective	Verb	Adverb
Trifolium reflexum	Yes	No	No	No
trefoil	Yes	No	No	No

As nouns, trefoil is a hypernym of Trifolium reflexum; that is, trefoil is a word with a broader meaning than Trifolium reflexum:

Other hypernyms of Trifolium reflexum include clover.

Trifolium reflexum (noun)	trefoil (noun)
clover of western United States	an architectural ornament in the form of three arcs arranged in a circle
	a plant of the genus Trifolium
	any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves