I am fascinated by the relationship between “ogre” and “orc”:

Etymology:  < French ogre (late 12th cent. in Old French in sense ‘fierce pagan’, c1300 in sense ‘man-eating giant’, attested again from 1613; also †hogre (1704 in the passage translated in quot. 1713 at main sense)), further etymology uncertain and disputed.

French ogre is perhaps < classical Latin Orcus , the name of the god of the infernal regions, Hades, Pluto (further etymology uncertain), with metathesis of r (perhaps influenced by words such asbougre bougre n.), or perhaps < post-classical Latin Ugri , Ungri , Ongri , applied by early writers to the Hungarians or Magyars (see Ugrian n.). Compare ( < classical Latin Orcus) Middle Frenchorque hell (16th cent.; probably a later reborrowing), and also Italian orco demon, monster (13th cent.), Spanish huerco devil, personification of death or hell (1330), Sardinian orcu demon, and early modern Dutch orck unruly person (Dutch regional ork). Spanish ogro (1787) is a borrowing from French ogre.

• 05.056 and ogres he had ever heard told of

“ogre, n.” OED Online. Oxford University Press, June 2015. Web. 25 June 2015.

• 06.041 got behind a tree to shelter from the onslaught of the rocks.
• 17.051 from the onslaught
• 17.053 They had only stemmed the first onslaught of the black tide.

• 01.001 and an oozy smell,

I love that even in The Hobbit the rich interconnectedness of the tongues which Tolkien played like an orchestra can be heard as nearby echoes.  Here we see the translation of goblins – a Hobbit enemy – into “orc” – their usual name in Lord of the Rings.

[03.035]  This, Thorin, the runes name Orcrist, the Goblin-cleaver in the ancient tongue of Gondolin;

• 03.035 This, Thorin, the runes name Orcrist,
• 04.033 They had called it Orcrist,
• 04.041 Orcrist, too, had been saved;
• 06.012 and everywhere with Orcrist.
• 10.025 and the great sword Orcrist too.
• 18.032 Upon his tomb the Elvenking then laid Orcrist,

• 14.033 and orphans?’

• 12.020 but they know it to an ounce as a rule,

• 09.053 Where the kine and oxen feed!