A word appearing in some 1964 notes on various elements of the mouth, specifically referring to the “interior cavity behind the teeth, containing tongue”, derived from the root √SOŊ (PE17/126). This is likely a technical term, as opposed to the more ordinary word for mouth: Q. anto.

Conceptual Development: An earlier word for the interior of the mouth was ᴱQ. matu “the mouth (inside)” from the Qenya Lexicon of the 1910s under the early root ᴱ√MATA (QL/59).

A noun in the Qenya Lexicon of the 1910s glossed “the mouth (inside)” derived from the early root ᴱ√MATA “eat”, which Tolkien compared to similarly derived ᴱQ. anto “jaw” (QL/59). Much later, Tolkien used Q. anto for “mouth” (LotR/1123), likely also derived from √MAT “eat”.