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
cantrib
noun.square
The Gnomish Lexicon of the 1910s had G. cantrib “a square”, a combination of G. cant “four” and G. rib “line” (GL/25).
Neo-Sindarin: For purposes of Neo-Sindarin I would update this to ᴺS. canthil “square” as a combination of can(ad) “four” and till “point”, analogous to [N.] nelthil “triangle”.
The Gnomish Lexicon of the 1910s had G. cantrib “a square”, a combination of G. cant “four” and G. rib “line” (GL/25).
Neo-Sindarin: For purposes of Neo-Sindarin I would update this to ᴺS. canthil “square” as a combination of can(ad) “four” and till “point”, analogous to [N.] nelthil “triangle”.