mustard vs cruciferous plant

mustard and cruciferous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
mustard	Yes	No	No	No
cruciferous plant	Yes	No	No	No

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

Other hypernyms of mustard include crucifer.

mustard (noun)	cruciferous plant (noun)
pungent powder or paste prepared from ground mustard seeds	any of various plants of the family Cruciferae
leaves eaten as cooked greens
any of several cruciferous plants of the genus Brassica