Disfranchise is preferred in American usage.
Discriminate means to perceive differences and use that perception to make a judgment. The players could not discriminate between a good golf hole and a bad one. Distinguish means to recognize qualities or features of a thing that make it different from others. The groundskeeper could easily distinguish bent grass and Kentucky blue grass.
Discrepancy is a difference between facts or claims. The appraised value and the asking price show a discrepancy. Disparity means inequality or incongruity. We found a big disparity between their ideals and their actions.
Discreet means to be careful about what one does or says. If you ask for a raise, be discreet; I don’t want Jim to know. Discrete means separate or distinct. The conversion process consists of five discrete steps.
Discover means to find something already in existence, but unknown. While on the expedition, Pete discovered a few new species. Invent means to create something new. Edison invented many useful devices for society.
Discomfit means to frustrate, disconcert, or baffle. Their questionable comments may discomfit the employees. Discomfort means pain, uneasiness, or distress. Helen’s sprained wrist gave her discomfort during the match.
Disburse means to pay out or expend. Accounting should disburse the travel compensation next week. Disperse means to scatter something. The road crew will disperse the road salt before rush hour.
Disassemble means to take something apart. To disassemble the hardware, follow the instructions. Dissemble means to disguise or conceal behind a false appearance. The man attempted to dissemble his guilt with laughter.
Disapprove means to withhold approval of something. Do you disapprove of the way Lou is handling his job? Disprove means to prove the falsity of something. Even if you disprove Jim’s claim, he may file again.