Yes, SHOWINGS is a Scrabble word!

Letter values in Scrabble US: S 1, H 4, O 1, W 4, I 1, N 1, G 2, S 1.

Is it a valid word?

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

give an exhibition of to an interested audience
establish the validity of something, as by an example, explanation or experiment
provide evidence for
make visible or noticeable
show in, or as in, a picture
give expression to
indicate a place, direction, person, or thing; either spatially or figuratively
be or become visible or noticeable
indicate a certain reading; of gauges and instruments
give evidence of, as of records
take (someone) to their seats, as in theaters or auditoriums
finish third or better in a horse or dog race

Also: bear witness, show up.