There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
hahta
noun. heap, pile, (piled) mound
hat
noun. ridge, comb, crest
A word appearing in the Declension of Nouns from the early 1930s glossed “comb, ridge” (PE21/19) and “ridge (comb, crest)” (PE21/27). It perhaps refers to raised formations of various kinds, geological as well as things like the comb or crest of a bird or the ridge of a roof.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A noun in The Etymologies of the 1930s glossed “pile, mound” derived from the root ᴹ√KHAG “pile up” (Ety/KHAG). It also appeared in the Outline of Phonetic Development (OP1) from the 1940s with the gloss “heap, piled mound” (PE19/45). In that document it illustrated how combinations of voiced stops were unvoiced so that ᴹ✶khagdā > ✱khakta > hahta. This derivation reappeared in Outline of Phonology (OP2) from the 1950s, but there the root was changed √KHAG >> √KHAB in revisions made in 1959 or later, and a new Quenya form Q. hamna was given (PE19/91-92).
Neo-Quenya: For purposes of Neo-Quenya, I’d use the later form Q. hamna and give Q. hahta its later meaning “fence, hedge” (PE19/91).