Early Quenya
orivaine
noun. pod, seed pod, pea; peapod (a boat)
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A word appearing as ᴱQ. orivaine “pod, seed pod, pea” in the Qenya Lexicon of the 1910s, a combination of ᴱQ. ore (ori-) “seed” and ᴱQ. vaine “sheath, pod” (QL/70). In the contemporaneous Poetic and Mythological Words of Eldarissa this word was glossed “peapod (a boat)” (PME/70).
Neo-Quenya: In Tolkien’s later writing he had ᴹQ. erde for “seed”, so I think this word could be updated to ᴺQ. erdevainë “seed pod, peapod” for purposes of Neo-Quenya. For an individual “pea” I would use ᴺQ. mildë.