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]
(..) - I like to think it's because I'm a Ione wolf. But mainly it's because people don't like me. There are certain endeavors... ...where your lack of personal connection would be considered an advantage. - This is a secure area. - They know me. Have you ever been here? We were told in our initial (..)2001 A Beautiful Mind