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.
manga
root. lacking
mṇgṇ
root. *butter
An unglossed root ᴱ√MṆGṆ appeared in the Qenya Lexicon of the 1910s with derivatives ᴱQ. mange “grease” and ᴱQ. manya “butter” (QL/62). G. mang “butter” from the contemporaneous Gnomish Lexicon is also almost certainly related (GL/56). In Qenya Word-lists from the 1920s Tolkien gave ᴱQ. mingwe “butter” which may be related (PE16/141).
Neo-Eldarin: For purposes of Neo-Eldarin, I think it is worth positing a root ᴺ√MANGYA to salvage early “butter” words.
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 root in the Qenya Lexicon of the 1910s glossed “lacking”, with derivatives ᴱQ. mange “lack, want, shortage” and ᴱQ. manka “few” (QL/59). There are no signs of this root in Tolkien’s later writing, and it may have been replaced by √PEN “lack” in the 1950s and 60s.