Qenya
serme
noun. friend (f.)
sermo
noun. friend
-ser
suffix. friend
seron
noun. friend
-el
suffix. friend
helde
noun. friend
heldo
noun. friend
helmo
noun. friend
málo
noun. friend
nilde
noun. friend (f.)
nilmo
noun. friend
sondo
noun. friend
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.