In Dutch: ballenbak, ball pit. Great to pronounce: ball-uh-bagk. Gezellig, the untranslatable word for coziness/togetherness.
My favourite words that I try not to say around kids: mierenneuker, 'antfucker', aka a nitpicker. Can also be a verb. Klootzak, 'bag of balls', used like the word asshole is used to describe people.
Words that I like in English: embezzled. Beguiling. Frantic. Ascending. Fervor.