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Is MASTOID a valid Scrabble word?

Yes, MASTOID is a valid word in US Scrabble and UK Scrabble, worth 10 points.

Base score before bonus squares; blank tiles score zero.

What does MASTOID mean?

  1. noun

    process of the temporal bone behind the ear at the base of the skull

  2. adjective

    of or relating to or in the region of the mastoid process

  3. adjective

    relating to or resembling a nipple

Definitions from WordNet 3.1, Princeton University.

Points

10

Scrabble

11

Words With Friends

7

Letters

M (3) + A (1) + S (1) + T (1) + O (1) + I (1) + D (2) = 10 points in Scrabble.

Dictionary status

  • Scrabble (US & Canada)Valid
  • Scrabble (UK & worldwide)Valid
  • Words With FriendsListed

Scrabble lists: NWL2023 (US & Canada) and CSW24 (UK & worldwide). WWF uses our ENABLE reference plus verified additions. “Listed” and “Not listed” describe that reference; check acceptance in the game. Sources reviewed 2026-10-03.

Hooks for MASTOID

Single letters that turn MASTOID into another valid word in US Scrabble. Hooks let you extend a word already on the board.

Front hooks0

None — nothing can be added to the front.

Back hooks1

Anagrams of MASTOID

Words that use exactly the same letters.

Words you can make from MASTOID

The 60 highest-scoring words using these letters.

Study MASTOID and related words

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