Early Quenya
fumella
noun. (red) poppy, *(lit.) flower of sleep
fúmelot valinoriva
(large) poppy
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 appearing as ᴱQ. {fūmella >>} fumella or fūmelot “poppy” in the Qenya Lexicon, with an initial element ᴱQ. fúme “sleep” and a second element of either the suffix -lla or a reduced form of ᴱQ. lóte “flower” (QL/39). In the contemporaneous Poetic and Mythological Words of Eldarissa the variants were fumella and fúmelot valinoriva “poppy” (PME/39). In other early notes Tolkien had “Fumella, the red poppy that grew in hosts in Lorien’s gardens” (PE15/14).
Neo-Quenya: Since Tolkien abandoned ᴱQ. fúme “sleep”, I would update this word to ᴺQ. lórelot “poppy, ✱(lit.) flower of sleep” using a later form lórë for “sleep”.