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.
-itsa
suffix. diminutive
-tsa
suffix. diminutive
-(l)inta
suffix. diminutive
-(w)inta
suffix. diminutive
-inya
suffix. diminutive
-itse
suffix. diminutive
-linte
suffix. diminutive
-litse
suffix. diminutive
-lla
suffix. diminutive
-lle
suffix. diminutive
-pi(t)
suffix. diminutive
-pin(ke)
suffix. diminutive
-íne(a)
suffix. diminutive
mi(e)-
prefix. diminutive
mike-
prefix. diminutive
miki-
prefix. diminutive
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.