Genius is correct.
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That is the correct spelling of "brilliance" (brightness or genius).
if you mean smart or clever person its spelt "genius".
Singular possessives of nouns always use the apostrophe S regardless of their spelling.The possessive would be genius's (e.g. a genius's IQ is very high).
The correct spelling is "genius" (brainy person, intellectual brilliance).
The word sought may be the proper noun Guinness, a surname.
Words that might apply to an "amazing person" are genius, wonder, virtuoso, phenomenon, or prodigy.
The correct spelling of the term is genius (very smart person).
genius, genius, brillance, genius, genius..........
The likely word is "genius" (brilliance, or a very smart person). The similar word is "genus" (taxonomy term, just above species).
"I am genius".
Yes, he was a genius