discovˈerer noun

1. A person who makes a discovery, esp of something never before known
2. An informer (obsolete)
3. A scout (Shakespeare)

discovˈery noun

1. The act of finding out
2. The thing discovered
3. Gaining knowledge of the unknown
4. The unravelling of a plot
5. Exploration or reconnaissance (as in voyage of discovery voyage of exploration)

discovered check noun

In chess, a check produced by moving a piece to leave a second piece attacking the opponent's king

discovery well noun

An exploratory oil well that proves to yield a commercially viable amount of oil