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.
ná-
verb. to be
ná(n)
adverb/conjunction. but, on the contrary, on the other hand
a
pronoun. it, one, indefinite subject
fírien
noun. Winter
hríve
noun. winter
le
pronoun. you
man(an)
adverb. when
nesse
noun. youth
nése
noun. youth
ringe
noun. cold, cold, *chill
vírie
noun. youth
ye-
verb. to be
íre
conjunction. when
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 correlatives manan or man “when” appeared in Demonstrative, Relative, and Correlative Stems (DRC) from 1948 (PE23/109), a combination of interrogative ᴹQ. ma and ᴹQ. -n(an) “time”.
Neo-Quenya: For purposes of Neo-Quenya I would stick to ᴹQ. mallume, since I think -n(an) was abandoned.