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.
dod
noun. berry
dod-
verb. to fall down, drop
A verb appearing as G. dod- “fall down, drop” in the Gnomish Lexicon of the 1910s (GL/30), clearly based on the early root ᴱ√ÐOTO “drop, fall” (QL/86).
Neo-Sindarin: There is a later verb danna- “fall”, but no later verb for “drop”, so I would retain ᴺS. dod- “to drop” for purposes of Neo-Sindarin, based on a Neo-Root ᴺ√DOT of the same meaning.
piog
noun. berry
A word in the Gnomish Lexicon of the 1910s glossed “berry”, the cognate of ᴱQ. piukka “blackberry” (GL/64; QL/74). The io is probably the result of the Gnomish sound change whereby iu became io (PE15/13).
Neo-Sindarin: In Sindarin, iu became ŷ, so this word might be adapted as ᴺS. pŷg, but I prefer to use ᴺS. dod for “berry”.
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 word G. dod “berry” appeared in the Gnomish Lexicon of the 1910s above G. dod- “fall down, drop” (GL/30), so perhaps originally meaning “✱a thing dropped”.
Neo-Sindarin: I would retain ᴺS. dod “berry” for purposes of Neo-Sindarin as a derivative of the Neo-Root ᴺ√DOT “drop”.