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]
(..) what we've done with the Internet. We've got every gang from Seattle to San Diego working together now. They're not competing. They're consolidated. Only thing we lack is a little overall leadership. And that's where you come in. Because people out there got a lot of respect for you, Derek. (..)1998 American History X