Yes, BROTHS is a Scrabble word!

Letter values in Scrabble US: B 3, R 1, O 1, T 1, H 4, S 1.

Is it a valid word?

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

liquid in which meat and vegetables are simmered; used as a basis for e.g. soups or sauces
a thin soup of meat or fish or vegetable stock