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]
(..) was engineered. Any danger? No. We put it through the cellular hygiene detector. The cell is, for lack of a better word, perfect. Ok. Go ahead. But Mr Perfect better be polite, or l'll turn him into cat food. Activate it. Tissue processing. (..)1997 The Fifth Element