The term 'make nervous' can be expressed in four different ways using crossword solutions. The first is 'UPSET, ' which is a five-letter word meaning to disturb the composure of someone or something. The second is 'FLUSTER, ' which is a seven-letter word meaning to cause confusion and agitation. The third is 'PERTURB, ' which is also a seven-letter word meaning to disturb or interfere with the normal functioning of something. Finally, the fourth is 'SPOOK, ' which is a five-letter word meaning to frighten or startle someone. All of these words describe the same concept of making someone or something nervous.