This root appeared in The Etymologies of the 1930s glossed “red” (Ety/KARÁN), a later iteration of ᴱ√KṚN of the Qenya Lexicon of the 1910s of the same meaning, but with syllabic ṛ (QL/48). Its main Quenya derivative, Q. carnë, retained the same form throughout Tolkien’s life, but its Gnomish forms G. carn(in) “scarlet” and G. crintha “rosy, pink” (GL/25, 27) became N. caran “red” in the 1930s, and retained that form thereafter.
Middle Primitive Elvish
rud
root. *piece of wood
karanā́
adjective. ruddy, scarlet
k’rannā
adjective. ruddy (of face)
roy
root. ruddy, red
gay
root. *red, copper-coloured, ruddy
karan
root. red
karani
adjective. red
kuldā
adjective. red
A root in The Etymologies of the 1930s glossed “red, copper-coloured, ruddy” with the derived adjectives ᴹQ. aira and N. goer of similar meaning (Ety/GAWA). It replaced a (deleted) root ᴹ√GAIRĀ (EtyAC/GAIRĀ). Its most notable derivative is the name N. Taragaer “Ruddyhorn” (Ety/TARÁK), which was the precursor in Lord of the Rings drafts of 1940s to the name of S. Caradhras “Redhorn” (RS/419). Given the eventual replacement of this name in the final version of The Lord of the Rings Tolkien likely abandoned this root, especially given its conflict with the later root √GAY(AR) “awe, dread” that was the basis for words for “sea”.