Early Quenya
falas(se)
noun. shore, beach, surf
ailin
noun. shore
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 word for “shore” in the ᴱQ. Oilima Markirya poem and its draft of the late 1920s (MC/213, 221), in one place given an archaic form aile and a translation “beach” (PE16/75). In the version of the Markirya poem from the 1960s, this word became Q. hresta (MC/221-222), whereas Q. ailin itself usually meant “lake” in later writings.