To eavesdrop means you secretly listen to the conversations of others. Some types of people are very good at eavesdropping. Nosy people, people who like to gossip and spies are all good eavesdroppers. The only difference among my examples is that spies get paid and could get killed for getting an earful.
Why does it use 'among', not 'between' when there only be two items (nosy people and spies)?