Paying, gainful, remunerative, and lucrative share the meaning of bringing in a return of money, but each term casts a different light on how much green you take in. Paying is the word for jobs that yield the smallest potatoes—your first paying job probably provided satisfactory compensation, but you weren't going to get rich by it. Gainful employment might offer a bit more cash, and gainful certainly suggests that an individual is motivated by a desire for gain. Remunerative implies that a job provides more than the usual rewards, but a lucrative position is the one you want—those are the kind that go beyond your initial hopes or expectations.