Yes, DISBURSEMENT is a Scrabble word!

Letter values in Scrabble US: D 2, I 1, S 1, B 3, U 1, R 1, S 1, E 1, M 3, E 1, N 1, T 1.

Is it a valid word?

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

amounts paid for goods and services that may be currently tax deductible (as opposed to capital expenditures)
the act of spending or disbursing money