Early Primitive Elvish
dyṇtṇ
root. DYṆTṆ
yṇtṇ
root. *(en)large, increase
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.
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.
The unglossed root ᴱ√DẎṆTṆ appeared in the Qenya Lexicon with derivatives like ᴱQ. yanta “large” and ᴱQ. yanta- “enlarge, increase, add to”; Tolkien also wrote and then erased a note saying “or ẎṆTṆ” (QL/106). In the contemporaneous Gnomish Lexicon Tolkien gave primitive yṇt as the basis for words like G. gant “larger, greater, more; (lit.) increased” and G. gantha “more” (GL/37). The superlative forms ᴱN. diant “most” and ᴱN. -iant from the Early Noldorin Grammar from the 1920s were probably related. I think it is worth positing a Neo-Root √GYANTA “(en)large, increase” to salvage some of these early words.