information:filtering, stylistic:style_transfer
Language construction

Parallel to Tolkien's professional work as a philologist, and sometimes overshadowing this work, to the effect that his academic output remained rather thin, was his affection for constructing languages. The most developed of these are Quenya and Sindarin, the etymological connection between which formed the core of much of Tolkien's legendarium. Language and grammar for Tolkien was a matter of aesthetics and euphony, and Quenya in particular was designed from "phonaesthetic" considerations; it was intended as an "Elven-latin", and was phonologically based on Latin, with ingredients from Finnish, Welsh, English, and Greek.

Tolkien considered languages inseparable from the mythology associated with them, and he consequently took a dim view of auxiliary languages: in 1930 a congress of Esperantists were told as much by him, in his lecture A Secret Vice, "Your language construction will breed a mythology", but by 1956 he had concluded that " Volapük, Esperanto, Ido, Novial, &c, &c, are dead, far deader than ancient unused languages, because their authors never invented any Esperanto legends".

The popularity of Tolkien's books has had a small but lasting effect on the use of language in fantasy literature in particular, and even on mainstream dictionaries, which today commonly accept Tolkien's idiosyncratic spellings dwarves and dwarvish (alongside dwarfs and dwarfish), which had been little used since the mid-19th century and earlier. (In fact, according to Tolkien, had the Old English plural survived, it would have been dwarrows or dwerrows.) He coined the term eucatastrophe, used mainly in connection with his own work.