lurker

noun4

1. •
   One who lurks.
2. •
   (Internet) A user who observes a community rather than participating; someone who reads or takes advantage of content on a website, newsgroup, etc. but does not contribute.

   • It’s not unusual for people to join video calls with their camera off and microphone muted, but such lurkers can at least be called upon to speak. — 2025
3. •
   (dialect, no longer used) A small fishing-boat.
4. •
   (slang, no longer used) An impostor; a quack.