They called it a comet, 'for lack of' a better term/word. [=because they could not think of a better term/word for it]
His honesty, or 'lack thereof', is the real problem. [=the real problem is his lack of honesty]
There was 'no lack of' interest in the proposal. [=there was much interest in the proposal]
(..) I'm not hiding with you. I'm hiding out with that big guy. Sensei, with your fate unknown, Bumblebee has held command, despite his complete and total lack of anything resembling warrior discipline. He's like a child. This child is about to kick your ass. He brings us shame. (..)2014 Transformers: Age of Extinction