Yes, heads is in the scrabble dictionary

...and is worth 8 points by itself if you played it.

Heads Definition

noun

Abbreviation for headphones.
Source: Wiktionary
Plural form of head.
Source: Wiktionary
That part of older sailing ships forward of the forecastle and around the beak, used by the crew as their lavatory; still used as the word for toilets on a ship.
Source: Wiktionary
The side of a coin that bears the picture of the head of state or similar.
Source: Wiktionary

interjection

A shouted warning that something is falling from above, mind your heads.
Source: Wiktionary

verb

Third-person singular simple present indicative form of head.
Source: Wiktionary