You are right about language, with contronyms and oxymorons. Especially in nomenclature, many things are named incorrectly or have contradictory names, such as Koala Bear, Whale Shark, Killer Whale, Starfish, Prairie Dog, King Cobra, Red Panda, Guinea Pig, Bearcat, Flying Lemur, Flying Squirrels, etc. Also, asteroid, which are not at all particularly "star like."