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