“Falter” may be related to “fold” in the sense of legs folding under unexpectedly.

• 08.029 but they heard the sound of hooves quickly falter

“falter, v.1.” OED Online. Oxford University Press, June 2015. Web. 27 July 2015.

Meaning, of course, a bundle of small sticks for use as woodfire fuel.  Its second meaning in the OED dates from the 1500s, a heretic who was burned alive as punishment.

• 03.015 The faggots are reeking,

“faggot | fagot, n.” OED Online. Oxford University Press, December 2015. Web. 11 February 2016.

Remember, in Tolkien’s parlance, “Faerie” is a place.  “Fairy”, by the way, is within the Ten Thousand most common words.

• 08.131 that never went to Faerie

Update 2016.02.11

From French, “little face”.

• 12.097 It was like a globe with a thousand facets;

“facet, n.2.” OED Online. Oxford University Press, June 2015. Web. 27 July 2015.

Spelled over a dozen different ways, this word is more likely to come from Latin ager – area, acre – than it is to come from “air”.  It’s not only the high nest of a raptor but in its second meaning is the collective noun for the brood of nestlings of such a bird.

• 06.088 and fell onto the rough platform of an eagle’s eyrie.
• 06.090 in his eyrie at night!
• 07.007 till your eyries receive you at the journey’s end!’
• 17.064 from all the eyries of the North.
• 18.027 but most have gone back to their eyries.