radish vs daikon

radish and daikon both are nouns.

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

As nouns, radish and daikon are synonyms defined as:

radish and daikon: radish of Japan with a long hard durable root eaten raw or cooked

Other synonyms of radish include Japanese radish, Raphanus sativus longipinnatus.

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

radish: 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

radish (noun)	daikon (noun)
pungent fleshy edible root	radish of Japan with a long hard durable root eaten raw or cooked
Eurasian plant widely cultivated for its edible pungent root usually eaten raw
pungent edible root of any of various cultivated radish plants
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