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Is PROTHROMBINS a valid Scrabble word?

Yes, PROTHROMBINS is a valid word in US Scrabble and UK Scrabble, worth 21 points.

Base score before bonus squares; blank tiles score zero.

What does PROTHROMBINS mean?

Prothrombins is a form of PROTHROMBIN.

  1. noun

    a protein in blood plasma that is the inactive precursor of thrombin

Definitions from WordNet 3.1, Princeton University.

Points

21

Scrabble

24

Words With Friends

12

Letters

P (3) + R (1) + O (1) + T (1) + H (4) + R (1) + O (1) + M (3) + B (3) + I (1) + N (1) + S (1) = 21 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 PROTHROMBINS

PROTHROMBINS has no one-letter front or back hooks in US Scrabble. Adding a single letter to either end does not make another word in that list.

Front hooks0

None — nothing can be added to the front.

Back hooks0

None — nothing can be added to the end.

Words you can make from PROTHROMBINS

The 60 highest-scoring words using these letters.

Study PROTHROMBINS and related words

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