A rejected (Noldorin-only?) root in The Etymologies of the 1930s initially glossed “knob, head, top”, perhaps replacing the also rejected root ᴹ√KOPAR of the same meaning (Ety/KEPER; EtyAC/KEPER, KOPAR). Tolkien changed the gloss of ᴹ√KEPER to “ridge” before he rejected the entry. The most notable derivative of this root was N. ceber in N. Sarn Gebir, whose gloss is unclear but might be “?limestone, -rock”. Despite his rejection of this root, S. Sarn Gebir did appear in The Lord of the Rings (LotR/391) and was in one place translated as “Stone-spikes” (RC/327), so perhaps Tolkien restored the root, though what it might mean is unclear.
Middle Primitive Elvish
top
root. cover, roof, roof, cover
tōp-
verb. to roof
keper
root. ridge; knob, head, top
kast
adverb. towards the top
kas
root. head
galad
root. tree
The basis for Elvish “tree” words, this root first appeared in The Etymologies of the 1930s as an extension of ᴹ√GALA “thrive” (Ety/GALAD). This replaced the earliest derivation of “tree” from the Qenya Lexicon of the 1910s, where the Qenya word for “tree” ᴱQ. alda was derived from ᴱ√ALA “spread” (QL/29). In The Etymologies, the Quenya form of this word remained the same, but the 1910s Gnomish words G. âl “wood” and †alwen “tree” (GL/19) became the 1930s Noldorin word N. galadh “tree” (Ety/GALA). Quenya and Sindarin retained these words for “tree” thereafter, and while Tolkien did not mention the root √GALAD again, his continued use of primitive ✶galadā “tree” (Let/426; PE17/153; PE21/74; UT/266) made it clear this root remained valid.
galadā
noun. tree
kas
noun. head
khar
root. helmet
kharan
root. helmet
kharap
root. helmet
A root in The Etymologies of the 1930s glossed “cover, roof” with derivatives like ᴹQ. tópa-/N. toba- “to roof”, ᴹQ. tópa “roof”, and N. tobas “roofing” (Ety/TOP). It was grouped together with and was apparently a variant of ᴹ√TUP (EtyAC/TOP), a root with a much lengthier history; see that entry for details. For purposes of Neo-Eldarin, I think this root could mean “roof” as opposed to √TUP = “cover”.