The term 'make certain of' can be expressed in three different ways in a crossword puzzle. The first is 'ENSURE, ' which is a six-letter word meaning to make sure that something happens or is done. The second is 'GUARANTEE, ' which is a nine-letter word meaning to promise that something will happen or be done. The third is 'seeto, ' which is a five-letter word meaning to make sure that something is done properly. All three words express the idea of making sure that something is done correctly and with certainty.