Qenya
ilúve
noun. universe, world; Heaven
ilúve ilu
proper name. Heaven, the universe, all that is
ilduma
noun. heaven
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A Quenya term appearing in Númenórean stories from the 1940s referring to the entirety of existence, both the physical universe and Heaven (SD/401), apparently a combination of ilúve “universe” or “Heaven” and ilu “universe, world”.