cruciferous plant vs crucifer

cruciferous plant and crucifer both are nouns.

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

As nouns, cruciferous plant and crucifer are synonyms defined as:

cruciferous plant and crucifer: any of various plants of the family Cruciferae

cruciferous plant (noun)	crucifer (noun)
any of various plants of the family Cruciferae	any of various plants of the family Cruciferae