A word in 1959 notes Tolkien described as “a tree-keep, a forester, a ‘woodsman’, a man concerned with trees as we might say ‘professionally’ (NM/20)”. It was given as an example of the use of the suffix -(n)dur, and its initial element is ornë “tree”.
noun. tree-keep, forester, woodsman
Word Gloss ornë “(tall) tree, (tall) tree, [ᴹQ.] high isolated tree” -(n)dur “servant; to serve”