In one on one coverage, a post route.
Comeback route- can be sat on
Slant- can be pressed (get away with contact)
Go- Cb has the inside position
Out- inside out, more room for error
Back shoulder fade/stop- the qb defends that himself, it's an incredibly hard pass to complete at a high rate.
Post- the WR always has better positioning and a slight touch draws a penalty. Of course if you have safety help, it's the easiest to defend.
Double moves are incredibly tough covers (see texans play action breakdown on the Z Report) however that comes as part of an entire play scheme rather than rputs.