Yes, MICROFILM is a Scrabble word!

Letter values in Scrabble US: M 3, I 1, C 3, R 1, O 1, F 4, I 1, L 1, M 3.

Is it a valid word?

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

film on which materials are photographed at greatly reduced size; useful for storage; a magnification system is used to read the material