canna vs canna lily

canna and canna lily both are nouns.

Word	Noun	Adjective	Verb	Adverb
canna	Yes	No	No	No
canna lily	Yes	No	No	No

As nouns, canna lily is a hyponym of canna; that is, canna lily is a word with a more specific, narrower meaning than canna:

canna: any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers
canna lily: plants grown for their large bright yellow to red flowers

Other hyponyms of canna include Canna generalis, achira, arrowroot, Canna edulis, Canna indica, indian shot.

canna (noun)	canna lily (noun)
any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers	plants grown for their large bright yellow to red flowers