The term 'Nasty Stinger' refers to three different types of insects: a WASP (4 letters), a HORNET (6 letters), and a Fireant (7 letters). Wasps are flying insects that are typically black and yellow in color, and they have a stinger at the end of their abdomen. Hornets are also flying insects, but they are larger than wasps and have a more aggressive sting. Fireants are small, reddish-brown ants that live in colonies and have a painful sting. All three of these insects have a nasty sting that can cause pain and discomfort.