The word ᴱQ. luksor appeared in the Qenya Lexicon of the 1910s with the gloss “swamp, bog” as a derivative of the root ᴱ√LUKU (QL/56). It also appeared in the Poetic and Mythological Words of Eldarissa with just the gloss “swamp”.

Neo-Quenya: The root √LUK had other meanings in Tolkien’s later writings. However, the later root √LOG “wet (and soft), soaked, swampy” seems to be similar in sense to early ᴱ√LUKU, so this word for “swamp, bog” might be salvaged as a neologism: *logso-rŏ > loksor > ᴺQ. loxor, perhaps originally an agental formation meaning “one who is muddy”. This neologism was originally suggested by Damien Bador in his translations of psalms into Quenya in 2018.