26. Endemic and Epidemic
Endemic means something prevalent in a particular area or among a people, and can refer to plants or animals or something less tangible, such as poverty. An epidemic is a disease that affects a large number of people within a community, population, or region.
27. Disinterested and Uninterested
These words are often used interchangeably, but disinterested means neutral or not having a stake in the outcome, whereas uninterested means you just don’t care.
28. Ensure and Insure
To ensure means to make sure something happens; to insure means to cover something with an insurance policy, which almost always means you don’t want it to happen.
29. Faint and Feint
As a verb, to faint means to pass out, while to feint means to fake something, such as an attack. As an adjective, faint means slight or imperceptible.
30. Fewer and Less
It’s not a super strict rule, but fewer should be used for things that can be counted, while less should be used for things that can’t be counted or don’t have a plural, like mass nouns such as salt or money. Fewer grammar mistakes mean less embarrassment.
31. Flaunt and Flout
To flaunt means to show off, whereas to flout means to openly disregard a rule. You could flout convention by flaunting your wealth.