Apostrophe. Astral. Impetigo. Bacchanalia. Its. It's. Feral. Impediment. Corporeal. Regina. Saskatoon. Pithy. Pneumonia. Gladiola. Hyacinth. Hundredweight. Centennial. Pancreas. Strait. Straight. Homonym. Antonym. Pleurisy. Sacroiliac. Bodacious. Salacious. Diarrhea. Millipede.

Funny. I'll bet my spell checker is smarter than a lot of college graduates. Then again I also spelled them right the first time.