What's the difference between grok and grot?

Grok

Definition:

Example Sentences:

Grot

Definition:

• (n.) A grotto.
• (n.) Alt. of Grote

Example Sentences:

• (1) "I myself am not very well-versed in the world of slash fiction," he says, marvelling at the time one would have had to spend to edit his perfectly innocent eight-hour recording into three minutes of steamy grot.