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.
panta-
verb. to unfurl, spread out, open, to open, spread out, unfurl, [ᴱQ.] unfold
panta
adjective. open, open, [ᴱQ.] wide, spreading
qanta
adjective. full
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 verb in The Etymologies of the 1930s glossed “to unfurl, spread out, open” under the root ᴹ√PAT (Ety/PAT).
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. panta- “open, unfold, spread” under the early root ᴱ√PATA² or PṆTṆ “open, spread out, show” (QL/72).