Skip to content
WWordFinderPro

Is EFFICACIOUSNESS a valid Scrabble word?

Yes, EFFICACIOUSNESS is a valid word in US Scrabble and UK Scrabble, worth 25 points.

Base score before bonus squares; blank tiles score zero.

What does EFFICACIOUSNESS mean?

  1. noun

    capacity or power to produce a desired effect

    “concern about the safety and efficacy of the vaccine”

Definitions from WordNet 3.1, Princeton University.

Points

25

Scrabble

29

Words With Friends

15

Letters

E (1) + F (4) + F (4) + I (1) + C (3) + A (1) + C (3) + I (1) + O (1) + U (1) + S (1) + N (1) + E (1) + S (1) + S (1) = 25 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 EFFICACIOUSNESS

EFFICACIOUSNESS 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 EFFICACIOUSNESS

The 60 highest-scoring words using these letters.

Study EFFICACIOUSNESS and related words

Have a full rack? Use the word finder to find every word you can play.