Early Quenya
itse
noun. small fly
-itse
suffix. diminutive
-litse
suffix. diminutive
-(l)inta
suffix. diminutive
-(w)inta
suffix. diminutive
-(w)inte
suffix. diminutive
-inya
suffix. diminutive
-itsa
suffix. diminutive
-linte
suffix. diminutive
-lla
suffix. diminutive
-lle
suffix. diminutive
-pi(t)
suffix. diminutive
-pin(ke)
suffix. diminutive
-tsa
suffix. diminutive
-íne(a)
suffix. diminutive
kaivo
noun. corpse
mi(e)-
prefix. diminutive
mike-
prefix. diminutive
miki-
prefix. diminutive
qelet
noun. corpse
The word ᴱQ. itse “a small fly” appeared in the Qenya Lexicon of the 1910s derived from the early root ᴱ√ITI “peck, bite (of flies), annoy” (QL/43).
Conceptual Development: A similar (archaic) word ᴹQ. tsette “fly” appeared in notes on The Feanorian Alphabet from the 1940s (PE22/51). This word is questionable given that while ps and ks were listed among valid initial clusters in Quenya, ts was not (PE19/38, 80).
Neo-Quenya: I would retain the Early Qenya word as ᴺQ. itsë “small fly”.