What's the difference between larker and lurker?

Larker

Definition:

• (n.) A catcher of larks.
• (n.) One who indulges in a lark or frolic.

Example Sentences:

Lurker

Definition:

• (n.) One who lurks.
• (n.) A small fishing boat.

Example Sentences:

• (1) But they’re also far-right lurkers who probably bid on Nazi memorabilia and have moved from white supremacist sites such as Stormfront.
• (2) It was a collection of short stories by HP Lovecraft called The Lurker In The Shadows and had a demon on the cover.