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Is CUMULONIMBUS a valid Scrabble word?

Yes, CUMULONIMBUS is a valid word in US Scrabble and UK Scrabble, worth 20 points.

Base score before bonus squares; blank tiles score zero.

What does CUMULONIMBUS mean?

  1. noun

    a dark cloud of great vertical extent charged with electricity; associated with thunderstorms

Definitions from WordNet 3.1, Princeton University.

Points

20

Scrabble

29

Words With Friends

12

Letters

C (3) + U (1) + M (3) + U (1) + L (1) + O (1) + N (1) + I (1) + M (3) + B (3) + U (1) + S (1) = 20 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 CUMULONIMBUS

CUMULONIMBUS 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 CUMULONIMBUS

The 60 highest-scoring words using these letters.

Study CUMULONIMBUS and related words

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