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.
yanda
adjective. dark, gloomy
-yanda
adjective. augmentative
-(y)ando
adjective. augmentative
-(v)ando
adjective. augmentative
-ilda
suffix. augmentative
-lda
suffix. augmentative
-umea
suffix. augmentative
-umya
suffix. augmentative
-úme
suffix. augmentative
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.
An adjective in the Qenya Lexicon of the 1910s glossed “dark, gloomy”, a derivative of the early root ᴱ√YAÐA (QL/105).