radish plant vs daikon

radish plant and daikon both are nouns.

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

As nouns, daikon is a hyponym of radish plant; that is, daikon is a word with a more specific, narrower meaning than radish plant:

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

Other hyponyms of radish plant include radish, Raphanus sativus, Japanese radish, radish, Raphanus sativus longipinnatus.

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