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.
alla
none, nothing, none, nothing, *no [adj.]
alla
interjection. hail!
alla earendel elenion ankalima
*hail Earendel, brightest of stars
allan(an)
adverb. never, at no time
al(a)-
prefix. not, negative prefix
la-
prefix. no, none, not any
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 negative adjective appearing as {(a)láqa >>} alla in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/105 note #67), so probably meaning “✱no” as in alla Elda pole quete “no Elf can say”. It can also be used pronominally to mean “nothing”, and for this function it has a variant lála (PE23/104). For example: merin alla “I want nothing”, or merin alla sino “I want none of this”.