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 expressed my doubts about the site. "Where it stood with graphics, how much programing was left "that I had not anticipated." "The lack of hardware we had to deal with site use, "the lack of promotion that would go on to successfully launch the website." This was the first time you raised (..)2010 The Social Network