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.
iti
root. peck, bite (of flies), annoy
iti Speculative
root. precious
A hypothetical root to explain words in the Gnomish Lexicon such as G. idra “dear, valued, precious” and G. idril “sweetheart”, the latter being the earliest etymology of the name G. Idril (GL/50). For the later etymologies of this name and the possible conceptual evolution of the root, see the entries for √IR “desire” and √IT “glitter, shine, shimmer, twinkle”.
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 “peck, bite (of flies), annoy” with derivatives like ᴱQ. itisya- “to itch, irritate” and ᴱQ. itse “small fly” (QL/43). The Gnomish word for “fly”, G. sitha, was probably related (GL/68). There are no signs of this root in Tolkien’s later writing, and the word for “fly” became Q. pupso/S. budhu (PE19/101). However, I think it is worth postulating a Neo-Eldarin root ᴺ√ITITH to salvage early Qenya words for itch and annoy.