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.
drab-
verb. to labour, work; (impersonal) to irk, annoy
drab
noun. labour, toil, irksome work
A noun appearing as G. drab “labour, toil (irksome work)” in the Gnomish Lexicon of the 1910s (GL/30).
Neo-Sindarin: I retain ᴺS. drab for (unpleasant) work for purposes of Neo-Sindarin, since it does not conflict with any later words or roots. [N.] tass “labour, task” can be used for work without the unpleasant connotation.
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 verb appearing as G. drab- meaning “labour, toil” in the Gnomish Lexicon of the 1910s (GL/30), with the sense “to irk, annoy” when used impersonally.
Neo-Sindarin: I retain ᴺS. drab- for (unpleasant) work for purposes of Neo-Sindarin, since it does not conflict with any later words or roots. [N.] muda- “labour, toil, ✱work” can be used for work without the unpleasant connotation.