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]
(..) telephone. In actual fact, Gretel, he was sent there because he failed to inform the authorities of his father's lack of loyalty to the Party. Which was his duty, I might add. - Which was his bad luck. - Bad luck? Well, bad luck that it was his father who was disloyal, and not his mother. (..)2008 The Boy in the Striped Pajamas