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Is OPSONIN a valid Scrabble word?

Yes, OPSONIN is a valid word in US Scrabble and UK Scrabble, worth 9 points.

Base score before bonus squares; blank tiles score zero.

What does OPSONIN mean?

  1. noun

    an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes

Definitions from WordNet 3.1, Princeton University.

Points

9

Scrabble

12

Words With Friends

7

Letters

O (1) + P (3) + S (1) + O (1) + N (1) + I (1) + N (1) = 9 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 OPSONIN

Single letters that turn OPSONIN 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

Words you can make from OPSONIN

The 60 highest-scoring words using these letters.

Study OPSONIN and related words

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