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]
(..) Thrust into the spotlight, Clair Murphy won't talk. "Anton Vallon." Search Results: DPD says Anton Vallon is no longer suspect. Due to lack of evidence Detroit free press. Unfortunately Murphy's investigation into Anton Vallon wasn't authorized in the first place. (..)2014 RoboCop