1. Utter a harsh, abrupt scream
   "The hawk skreaked as it swooped down on its prey";
   - squawk, screak [dialect], skreigh [UK, dialect], screech
    
2. Make a high-pitched, screeching noise
   - whine, squeak, screech, creak, screak [dialect]

Type of: call, cry, holler [informal], hollo [non-standard], make noise, noise, resound, scream, shout, shout out, squall, yell