daikon vs radish plant

daikon and radish plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
daikon	Yes	No	No	No
radish plant	Yes	No	No	No

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

daikon: radish of Japan with a long hard durable root eaten raw or cooked
radish plant: a cruciferous plant of the genus Raphanus having a pungent edible root

Other hypernyms of daikon include radish.

daikon (noun)	radish plant (noun)
radish of Japan with a long hard durable root eaten raw or cooked	a cruciferous plant of the genus Raphanus having a pungent edible root