Quenya 

tolma

protuberance contrived to serve a purpose, knob, short rounded handle

tolma noun "a protuberance contrived to serve a purpose, knob, short rounded handle", etc. (VT47:28)

tolma

noun. protuberance contrived to serve a purpose, knob, short rounded handle, knob, (short rounded) handle, protuberance contrived to serve a purpose

A noun in notes from the late 1960s glossed “a protuberance contrived to serve a purpose, knob, short rounded handle” derived from √TOL “stick out” (VT47/28).

Conceptual Development: A similar word ᴱQ. tolos (toloss-) “knob, lump” appeared in the Qenya Lexicon of the 1910s under the early root ᴱ√TOLO (QL/94).

tolos

knob, lump

tolos noun "knob, lump" (LT1:269; this "Qenya" form would seem to be a precursor of Quenya tolma, q.v.)

carma

helm

carma (2) noun "helm" (helmet) in Carma-cundo ("k") "Helm-guardian" (PM:260). Notice that in PE17:114, Tolkien indicated that he rather wanted carma to mean "tool" or "weapon", leaving the status of carma "helmet" uncertain. Possibly shortened to -car in the names Eldacar (Elfhelm?), Hallacar (Tall-helm?) Cf. also cassa in Etym.

carma

noun. helm

Quenya [PE17/114; PM/260] Group: Eldamo. Published by