noun, noun which may take the genitive case particle 'no'
Often used in compounds like 至上主義 (supremacism) or as a no-adjective meaning 'the highest' or 'ultimate'. Slightly formal.
彼は芸術至上の人生を送った。
He lived a life devoted to art above all else.
安全は至上の課題です。
Safety is the paramount issue.