autumn crocus vs bulbous plant

autumn crocus and bulbous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
autumn crocus	Yes	No	No	No
bulbous plant	Yes	No	No	No

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

autumn crocus: bulbous autumn-flowering herb with white, purple or lavender-and-white flowers; native to western and central Europe
bulbous plant: plant growing from a bulb

autumn crocus (noun)	bulbous plant (noun)
bulbous autumn-flowering herb with white, purple or lavender-and-white flowers; native to western and central Europe	plant growing from a bulb