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 

uile

noun. long trailing plant

A noun under the root ᴹ√UY in The Etymologies of the 1930s that Tolkien said was a “long trailing plant, especially seaweed”, though he did give a separate word ᴹQ. earuile for “seaweed” (Ety/UY).