Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!

Gnomish

tholos

noun. axle of a wheel

A word appearing as G. tholos “axle of a wheel” in the Gnomish Lexicon of the 1910s as a noun form of G. thol- “roll” (GL/73).

Neo-Sindarin: Since I retain ᴺS. thol- “to roll” for purposes of Neo-Sindarin, I would retain ᴺS. tholos “axle [of a wheel]” as well, from primitive ✱tholossē.

tholos

noun. sea-marge