Early Quenya
erefainu
noun. release
erevainu
noun. release
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 noun(?) in the Qenya Lexicon of the 1910s glossed “release” as combination of ᴱQ. ere- “out” and ᴱQ. fainu- “to release” (QL/36). Tolkien said that “f [was] retained because of cpd. sense”, in other words intervocalic f did not become v as it usually did in Early Qenya (PE12/20) because it was part of a recognized compound. This word also had a variant erevainu where the intervocalic change did occur.