I tried this 5 person variant yesterday and it worked well. Divide into two teams of two with one "spoiler." The spoiler is a person who belongs to neither team and guesses on everything. If the spoiler gets a word before the team member does then the person giving the clues must go on to the next word rather than pass the timer. Ties go to the team.
There was a many a groan of despair as the spoiler would get a word as the timer ran down. Some people will enjoy the role of spoiler more often than others of course.