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!

Qenya 

earuile

noun. seaweed

A noun for “seaweed” in The Etymologies of the 1930s, a combination of ᴹQ. ear “sea” and ᴹQ. uile “long trailing plant” (Ety/UY).