Elrex is an early culture and language in the Jastu‐Fizonal sprachbund. Most of the words in the known Elrex lexicon pertained to feelings or emotions, as these are the words which went on to influence later languages. Elrex is highly onomatopœic and features a large number of vowels. The spelling Lrex has traditionally been used as a shorthand for Elrex.

The words below are grouped into six generations based on their approximate times of origin. The earliest of these are categorized as Elrex version 1 and the latest as Elrex version 6. As most of the influence on later Jastu‐Fizonal languages occured around the time of Elrex version 5, our knowledge of Elrex version 6 is incomplete.

Definitive etymological classifications for Elrex words have not been made. However, in the later Elrex versions, broad associations have been noted. These are marked via a U+223B ∻ HOMOTHETIC Unicode character below.

As Elrex is in essence a speculative proto‐language, the pronunciation data should not be taken as anything more than a broad guideline. However, given an American English dialect, the following pronunciation key may be helpful:

Elrex has been given the language code qlr; the script subtag Latn should also be supplied. Elrex has no known native script.