shamrock vs trefoil

shamrock and trefoil both are nouns.

Word	Noun	Adjective	Verb	Adverb
shamrock	Yes	No	No	No
trefoil	Yes	No	No	No

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

shamrock: clover native to Ireland with yellowish flowers; often considered the true or original shamrock
trefoil: a plant of the genus Trifolium

Other hypernyms of shamrock include clover.

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

shamrock: creeping European clover having white to pink flowers and bright green leaves; naturalized in United States; widely grown for forage
trefoil: a plant of the genus Trifolium

Other hypernyms of shamrock include clover.

shamrock (noun)	trefoil (noun)
clover native to Ireland with yellowish flowers; often considered the true or original shamrock	an architectural ornament in the form of three arcs arranged in a circle
creeping European clover having white to pink flowers and bright green leaves; naturalized in United States; widely grown for forage	a plant of the genus Trifolium
Eurasian plant with heart-shaped trifoliate leaves and white purple-veined flowers	any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves