A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Anyone running a node is an operator.
An operator that has staked a bid but does not currently have a validator slot is a *staked operator*.
An operator whose bid has won a validator slot in the auction for a specific era is a validator in that era.
It is common for a staked operator to win an auction slot for many eras in a row and thus be a validator for a range of eras.