• 天才てんさい — genius
• 才能さいのう — talent
• 才女さいじょ — talented woman
• 多才たさい — multitalented
• 秀才しゅうさい — excellent student
• 英才えいさい — gifted child

The kanji 才 originally came from a pictograph showing a hand and a tree. It was borrowed phonetically to represent the concept of innate talent or ability. It is also used as an age suffix, like “5才” (5 years old).