Yes, LAITIES is a Scrabble word!

Letter values in Scrabble US: L 1, A 1, I 1, T 1, I 1, E 1, S 1.

Is it a valid word?

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

in Christianity, members of a religious community that do not have the priestly responsibilities of ordained clergy

Not playable in Scrabble US: TEMPORALTY.