genius vs scintillation

genius and scintillation both are nouns.

Word	Noun	Adjective	Verb	Adverb
genius	Yes	No	No	No
scintillation	Yes	No	No	No

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

Other hyponyms of genius include coruscation, pyrotechnics, savant syndrome.

genius (noun)	scintillation (noun)
exceptional creative ability	the quality of shining with a bright reflected light
a natural talent	the twinkling of the stars caused when changes in the density of the earth's atmosphere produce uneven refraction of starlight
unusual mental ability	a brilliant display of wit
someone who has exceptional intellectual ability and originality	a rapid change in brightness; a brief spark or flash
someone who is dazzlingly skilled in any field	(physics) a flash of light that is produced in a phosphor when it absorbs a photon or ionizing particle