Yes, ACCOUNTINGS is a Scrabble word!

Letter values in Scrabble US: A 1, C 3, C 3, O 1, U 1, N 1, T 1, I 1, N 1, G 2, S 1.

Is it a valid word?

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

a convincing explanation that reveals basic causes
a system that provides quantitative information about finances
the occupation of maintaining and auditing records and preparing financial reports for a business
a bookkeeper's chronological list of related debits and credits of a business; forms part of a ledger of accounts
a statement of recent transactions and the resulting balance

be the sole or primary factor in the existence, acquisition, supply, or disposal of something
keep an account of
to give an account or representation of in words
furnish a justifying analysis or explanation

Also: accounting system, method of accounting, account statement, answer for.