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.
fladwen
noun. meadow, grassland
fladweth
noun. meadow, grassland
glair
noun. meadow
A noun in the Gnomish Lexicon of the 1910s glossed “meadow” (GL/34). It also had an archaic variant form †lair, but Tolkien rejected this (GL/52). It was probably derived from the early root ᴱ√LAẎA “be alive, flourish” as suggested by Christopher Tolkien (LT1A/Tári-Laisi; QL/52).
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 Gnomish Lexicon of the 1910s glossed “meadow, grassland”, an elaboration of G. flad “sward, grass”; it also had a variant form [flad]weth (GL/34).