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.
tea
noun. straight line, road
-nta
suffix. *their
-ssa
suffix. *their
helle
noun. sky
A noun in The Etymologies of the 1930s glossed “sky” derived from the root ᴹ√ƷEL of the same meaning (Ety/ƷEL).
tie
noun. path, course, line, direction, way
té
noun. path
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 word in The Etymologies of the 1930s glossed “straight line, road” under the root ᴹ√TEÑ “line, direction” (Ety/TEÑ).
Neo-Quenya: For purpose of Neo-Quenya I assume its primary meaning is a simple straight line and is used for “road” only metaphorically, with the further implication that the road is straight. Since Tolkien changed the meaning of √TEÑ to “signify”, I further assume tea “straight line” is derived from ✱tegā based on the later root √TEG “line”.