Yes, KAKIS is a Scrabble word!

Letter values in Scrabble US: K 5, A 1, K 5, I 1, S 1.

Is it a valid word?

KAKIS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

small deciduous Asiatic tree bearing large red or orange edible astringent fruit
blackish stilt of New Zealand sometimes considered a color phase of the white-headed stilt

Also: japanese persimmon, diospyros kaki, himantopus novae-zelandiae.