freesia vs iridaceous plant

freesia and iridaceous plant both are nouns.

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

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

freesia: any of several plants of the genus Freesia valued for their one-sided clusters of usually fragrant yellow or white or pink tubular flowers
iridaceous plant: any bulbous plant of the family Iridaceae

freesia (noun)	iridaceous plant (noun)
any of several plants of the genus Freesia valued for their one-sided clusters of usually fragrant yellow or white or pink tubular flowers	any bulbous plant of the family Iridaceae