Don't you think that you contradict yourself? I've never heard teeth gnash loudlyGnashing is what teeth do, so to use it with "creak" sounds ridiculous. Also I think of a "creak" as quite a quiet noise, whereas "gnash" would imply a rather loud, violent noise.
What would you change in my sentence to add some "literary" effect? I mean, imagine it's a detective story.Creak is onomatopaeic, so are gnash and squeak, so using those words together as you suggest would also be a bit odd, though you could still use them in the same sentence, for effect.
It begins to resemble the Russian forum: different natives, different opinions What's wrong with let out?I also have doubts about "let out" in your original sentence, as that doesn't really go with "creak" either.
It's neither the first nor the second. Do you know the sound of plastic foam rubbed against the glass? It's very unpleasant. I don't know how to describe it. Here I'm talking about the effect the sound of the opening door has on me. As for the sound itself, suppose, the hinges are rusty and the door creaks when opens.I'll be happy to give you some suggestions but only if I can first understand what effect you're trying to get.