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]
(..) You're getting slow in your old age, Alfred. It comes to us all, master Wayne. Even you got too old to die young, and not for lack of trying. Funnel, fairy, bubblebath. Funnel, fairy, bubblebath. There's nothing wrong with the microphone. It's this new layer or armor. (..)2016 Batman v Superman: Dawn of Justice