I was inclined to agree with you at first, but I realized that they would be more appropriate in another list, such as "Tolkien's creatures". Dwarrows are no more a real part of our language than ents, even though both originated with an (archaic) English word.
Most English-speaking people will admit that cellar door is 'beautiful', especially if dissociated from its sense (and from its spelling). More beautiful than, say, sky, and far more beautiful than beautiful. -J.R.R. Tolkien, English and Welsh
As for the Deerslayer, under the sobriquet of Hawkeye, he made his fame spread far and near, until the crack of his rifle became as terrible to the ears of the Mingos, as the thunders of the Manitou.
-James Fenimore Cooper, The Deerslayer