tweeter

noun4

1. •
   One who or that which makes a tweeting noise.

   • The little tweeter birds that had kept her company this morning were now absent, leaving nothing but the whisper of the trees as a light breeze gently wandered by. — 2017
2. •
   One who posts messages ("tweets") on the social networking site Twitter.

   • The latest addition to these daily outpourings are suggested tweets to circulate. Fortunately I am not a tweeter, so I swiftly delete all these unread. — 2013
3. •
   A poster on a microblogging social networking service.
4. •
   An electronic speaker designed to produce high-frequency sound.