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I find the distinction between -ology and -onomy endings wanton.
For instance:
  • Astronomy: scientific study of stars
  • Astrology: occult/religious study of stars
Compared with
  • Gastroenterology (sometimes shortened to Gastrology): scientific study of your guts
  • Gastronomy: occult/religious study of your guts (at least this is how good food hits me)