solar flare vs solar radiation

solar flare and solar radiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
solar flare	Yes	No	No	No
solar radiation	Yes	No	No	No

As nouns, solar radiation is a hypernym of solar flare; that is, solar radiation is a word with a broader meaning than solar flare:

solar flare: a sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference
solar radiation: radiation from the sun

solar flare (noun)	solar radiation (noun)
a sudden eruption of intense high-energy radiation from the sun's surface; associated with sunspots and radio interference	radiation from the sun