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.
lā
root. LĀ
la
root. no, not; to be not
la(n)srondo
noun. hearer, listener, eavesdropper
la-
prefix. no, not, negative prefix
k’lā
noun. light
glā
noun. radiance
kalat
noun. light
ala
root. no, not; to be not
oiyā
adjective. everlasting
pat
root. *open, [ᴱ√] open, wide, spreading
gū
root. no, not
gālæ
noun. light
gū̆-
interjection. no, not
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 unglossed root in The Etymologies of the 1930s with derivatives like ᴹQ. panta- “to unfurl, spread out, open” and N. panna- “to open, enlarge”, along with ᴹQ. panta “open” and N. pann “wide” (Ety/PAT). It seems to be a later iteration of ᴱ√PATA² or ᴱ√PṆTṆ from the Qenya Lexicon of the 1910s glossed “open, spread out, show” with very similar derivatives like ᴱQ. panta “open, wide, spreading” and ᴱQ. panta- “open, unfold, spread” (QL/72). In Tolkien’s later writings, ✱√PAT seems to mean “step” or “walk”; see that entry for details.
Neo-Eldarin: Despite the later shift in meaning for √PAT, I think this earlier sense “open (wide)” can be salvaged by assuming that form of the root is actually ✱√PANAT or ✱√PANTA, which is consistent with most of its derivatives. For the non-verbal senses of “open”, I think √LAT is generally better.