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]
(..) Dialogue: Marked=..,Default,NTP,!Effect,But l was wrong. Dialogue: Marked=..,Default,NTP,!Effect,Five points will be taken\Nfrom Gryffindor... Dialogue: Marked=..,Default,NTP,!Effect,...for your serious lack of judgment. Dialogue: Marked=..,Default,NTP,!Effect,As for you two gentlemen... (..)2001 Harry Potter and the Sorcerer's Stone