Christopher Tolkien mentions this as a noun meaning “star” from early and unpublished materials related to “The Notion Club Papers” stories (PM/372). It may be an element in the early Adûnaic name Indilzar for Elros. As Indilzar was replaced by Gimilzôr, it is likely that azar was replaced by gimli and gimil, which are well attested in later writings.
azarnoun. star (draft)
azranoun. sea, seas
The Adûnaic word for “sea” (SD/429), appearing as azar in some early texts (SD/305). It is fully declined on SD/431.