The Adûnaic name (or title) for Sauron (SD/250). It simply the word zigûr “wizard” used as a name.
Adûnaic
zigûr
noun. wizard
zigûr
masculine name. Sauron
Sindarin
curunír
noun. wizard
curunír
noun. wizard, wizard, [N.] man of craft
ithron
noun. Wizard
curunír
wizard
(i gurunír, o churunír) (man of craft), no distinct pl. form except with article (i churunír), coll. pl. curuníriath.
ithron
wizard
(= Quenya istar, one of the order Gandalf belonged to), pl. ithryn, coll. pl. ithronnath (UT:388)
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!
Qenya
sauron
masculine name. Sauron
sairon
noun. wizard
Gnomish
curug
noun. wizard
thothweg
noun. wizard
Early Quenya
kuruvar
noun. wizard
A noun translated “wizard” and given as an example of a noun with a long vowel in its final syllable that (archaically) uses the declension for a strong-noun (SD/437), the rare class of Strong-Ib nouns. By the time of Classical Adûnaic, it could be declined as an ordinary weak-noun instead. As the proper name Zigûr, it was the Adûnaic name for Sauron.