Middle Primitive Elvish
yab
root. fruit
yāba
noun. fruit
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 first appearance of this root was as unglossed ᴱ√Ẏ̯AVA in the Qenya Lexicon of the 1910s with a Gnomish form gav- and derivatives like ᴱQ. yausta “crop” and ᴱQ. yáva “fruit, produce” (QL/105). The Gnomish form appeared as the verb G. gav- “produce, yield, bear fruit” in the contemporaneous Gnomish Lexicon along with other derivatives like G. gaust “corn, crop (espec. of cereal)” and G. gôf “fruit” (GL/38). In the Gnomish Lexicon Tolkien specified the primitive form as √ı̯aƀa and said “note not gı̯aƀ, for cp. Ivon < ı̯ǝƀánna, Q Yavanna” (GL/38).
The root appeared as ᴹ√YAB “fruit” in The Etymologies of the 1930s with derivatives like ᴹQ. yáve “fruit” and N. iau “corn” (Ety/YAB). Tolkien’s continued use of Q. yávë for “fruit” (VT43/31) and the names Q. Yavanna/S. Ivann “Fruit-giver” (S/27; LotR/1110) indicate the ongoing validity of this root.