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.
gwilbriniol
adjective. like a butterfly
mabinos gwilbriniol
noun. sycamore
blantos
noun. sycamore
mavlantos
noun. sycamore
A word appearing as G. mavlantos “sycamore” in the Gnomish Lexicon of the 1910s, apparently a blending of G. mavlant “palm” and G. blantos “sycamore” (GL/23, 55). This word likely refers to the sycamore’s flat and palm-like leaves.
Neo-Sindarin: For purposes of Neo-Sindarin I would adapt this word as ᴺS. mablanthos, a noun formation based on mâb and [ᴺS.] plant “flat”.
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 “sycamore” in the Gnomish Lexicon of the 1910s, apparently a noun form of G. blant “flat”, likely referring to its leaves and possibly a reduced form of G. mavlantos of the same meaning (GL/23).