These are fun ones and are very often misused. I think the easiest way to differentiate is to just write sentences with them.
EXAMPLES
Peek a boo! I see you!
The peak was over six thousand feet high.
The concept piqued the child’s interest, so they gave the child more to study.
We played peek a boo with each peak as it peeked around the corner; it was just enough to pique the toddlers interest and kept zir attention.
For the record, this brings me no pleasure to write. I had hoped and prayed that Adam Gaffen, who is a self-proclaimed writer of LGBTQ+ science fiction, mostly sapphic in nature, would be the one writing this and not me, but his attempt at it has been tepid, and I...
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This makes me think of Stealth Mountain. It’s a Twitter account, and the only thing they do is correct people who type “sneak peak” when they mean “sneak peek” (get it? 😀 )
They have 398,000 tweets already. I’d say that makes this a common problem.