Lucrative means productive wealth or profit, moneymaking.
Lucrative comes under adjective
Synonyms: fruitful, gainful, high paying, prosperous.
Antonyms: unfruitful, low paying, unprofitable.
It is true that Ravi's business is very lucrative, but it also happens to be illegal.
Spending time on ISC is very lucrative.
My friend took a small, unprofitable business and turned it into the lucrative corporation that it is today.