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.
mara
root. *sand, soil
mara
root. ripe, yellow
A root in the Qenya Lexicon of the 1910s glossed “ripe, yellow”, a variant of ᴱ√MALA “yellow” (QL/59). It had derivatives like ᴱQ. marin(a)/G. mar(o)n “ripe” and ᴱQ. marin/G. maros “ripe fruit” (QL/59; GL/56). There are no signs of this root in Tolkien’s later writing; one sign of its abandonment is the change of “orange” from ᴱQ. kulmarin (kul- + marin) to ᴹQ. kuluma (QL/49; Ety/KUL).
gu̯ara-
verb. to dwell
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 root appearing in the Qenya Lexicon of the 1910s as root {ᴱ√MAŘA² >>} ᴱ√MARA that Tolkien indicated was a dialectical variation or byform of ᴱ√MṚŘṚ [MṚÐṚ] “grind”, with a single derivative: ᴱQ. marilla “pearl” (QL/59). In the contemporaneous Gnomish Lexicon, G. brithla “pearl” was most likely a derivative of ᴱ√MṚÐṚ (GL/24). However, in the m-section of GL Tolkien said “mar and môr probably conceal two roots and a confusion [with] mbara”, with various apparent derivatives of mar- such as G. mar “Earth, ground, soil”, G. marol “sand” and G. Môr “the Earth” (GL/56). Tolkien also had G. mara- “dwell”, but it appeared before a variant (m)bara and so likely was derived from ᴱ√MBARA “dwell, live” as mentioned in the Qenya Lexicon (QL/60). As for ᴱ√MARA² itself, it may have meant “✱sand, soil”.