"ENSURE" and "INSURE"

"Ensure" means to guarantee or make certain. "Insure" refers to obtaining insurance coverage. Ex.: Please ensure the door is locked. We need to insure our new car.

"COMPLEMENT" and "COMPLIMENT"

"Complement" means to complete or enhance. "Compliment" means to praise or express admiration. Ex.: The dessert complements the meal beautifully. He received a heartfelt compliment on his performance.