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]
(..) "Cale frequently does not complete his field reports on time." Nothing to do with protecting someone. "Sergeant Cale demonstrates a lack of respect for authority. Sergeant Cale has raw potential but seems determined not to realise it." You can keep reading that. That is not me anymore. (..)2013 White House Down