Yes, ACCOUNTS is a Scrabble word!

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

Is it a valid word?

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

a record or narrative description of past events
a short account of the news
a formal contractual relationship established to provide for regular banking or brokerage or business services
a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.
grounds
importance or value
a statement of recent transactions and the resulting balance
the act of informing by verbal report
an itemized statement of money owed for goods shipped or services rendered
the quality of taking advantage

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: news report, write up, business relationship, account statement, answer for.