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]
(..) - Thank you. You mind if I come down there and see what you're doing? Good night, Obie. Day , test , configuration .. For lack of a better option, Dummy is still on fire safety. If you douse me again, and I'm not on fire, I'm donating you to a city college. Okay. (..)2008 Iron Man