The word is in the Wiktionary

1 short excerpt of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English word —

efficaciousness n. Quality of being efficacious.

3 English words from the English definition

being efficacious Quality

One prefix (New word found by adding one or more letters in front of the word.)

inefficaciousness

30 words-in-word (Words found as is inside the word. Minimum size 3 letters.)

ACI -acious CAC CIO eff EFF efficacious ess ESS -ess Ess. FFI fic FICA ICA -ica ICAC IOU IOUs -ious NES ness Ness -ness ous -ous SNe SNES USN usness

23 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)

ACI CAC CIF ens ENS Ens. ICA -ica ICAC iff IFF oic OIC -oic OIc. sen Sen SEN Sen. sens Sens Sens. SSE

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