My letters can form Lap rest Lets rap Pal rest Last rep Platers

I lock a door without a key. Slide and twist is all there is to me. Change my first and: - be a bunch of cookies - crawl out of an egg - mend a tear - tell the time

I am poured without a voice, Turned without walking, Layered without pages, And devoured without sorrow. I rise, yet I have no wings. I’m flipped, yet I never fall.

A treacherous trench, named for its users; a vertical entry for some lesser gentry- best pay attention if the cover’s askew, for else it might mean the last of you

Depending on my size and my makeup, I might hold curtains or power nuclear reactors.