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.
inc
adjective. little
inig
adjective. small
A word for “small” in the Gnomish Lexicon with variants ineg and G. inc (GL/51). Tolkien said this word was “especially used in quantitative sense as opposite of odog [great]”, as in inig bast no odog saith “✱small bread then great hunger”. It was clearly based on the early root ᴱ√INI “small” (QL/42).
aina
adjective. small
ineg
adjective. small
mad-
verb. to eat
migin
adjective. little
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 word for “little” mentioned in the Gnomish Grammar of the 1910s (GG/16). It also appeared in contemporaneous the Gnomish Lexicon as a variant of G. inig “small” (GL/51).