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.
tusc
adjective. inflammable; touchy, irritable; explosive
tusc ar fesc
*irritable and irritating
tustarol
adjective. inflammable
A word in the Gnomish Lexicon of the 1910s glossed “inflammable”, an adjectival form of G. tusta- “inflame” (GL/72).
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.
An adjective in the Gnomish Lexicon of the 1910s glossed “inflammable - touchy, irritable - explosive” derived from primitive early root ᴱ√tudh- (GL/72), where ð became s before stops like k in Gnomish. Since there are no signs of this Gnomish sound change in later Noldorin or Sindarin, this word was likely abandoned.