crocus vs iridaceous plant

crocus and iridaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
crocus	Yes	No	No	No
iridaceous plant	Yes	No	No	No

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

crocus: any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated
iridaceous plant: any bulbous plant of the family Iridaceae

crocus (noun)	iridaceous plant (noun)
any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated	any bulbous plant of the family Iridaceae