canna vs achira

canna and achira both are nouns.

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

As nouns, achira is a hyponym of canna; that is, achira 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
achira: canna grown especially for its edible rootstock from which arrowroot starch is obtained

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

canna (noun)	achira (noun)
any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers	canna grown especially for its edible rootstock from which arrowroot starch is obtained