look for/ search for

[GeneD]

I've searched everywhere for John, but I haven't been able to find him.

"Search for" and "look for" seem to be interchangeable, but would the sentence be correct if changed as follows?
I've looked everywhere for John, but I haven't been able to find him.

 

[Rover_KE]

Yes.

The difference is that 'search' usually involves a more thorough hunt for a small lost object like a ring or a key, where you lift things up and move stuff about to look under cushions and furniture, or through piles of dirty clothes, waste bins, papers and magazines—places a missing person is not likely to be.

 

[Winwin2011]

Yes.

The difference is that 'search' usually involves a more thorough hunt for a small lost object like a ring or a key, where you lift things up and move stuff about to look under cushions and furniture, or through piles of dirty clothes, waste bins, papers and magazines—places a missing person is not likely to be.

Does it mean “I am looking for my key” is unnatural?

 

[emsr2d2]

"I'm looking for my key" is more natural than "I'm searching for my key" to me.