冴える[saeru] to be clear (of a sight, sound, colour, etc.)
冴え輝く[saekagayaku] to shine clearly
冴え行く[saeyuku] to clear gradually
冴え冴えした[saezaeshita] cheerful (look)
冴え冴えとした[saezaetoshita] cheerful (look)

冴え渡る[saewataru] to get cold
冴返る[saekaeru] to be very clear
頭の冴え[atamanosae] bright intelligence
腕の冴え[udenosae] dexterity

輝やかしい[kagayakashii] brilliant
輝かす[kagayakasu] to light up
輝き[kagayaki] radiance
輝く[kagayaku] to shine
輝石[kiseki] pyroxene

輝線[kisen] bright line
輝度[kido] brightness
輝煌帝[kikoutei] poetic word for the sun
光輝く[hikarikagayaku] to shine
光輝[kouki] brightness