showstopper

Noun showstopper has 2 senses

• showstopper(n = noun.communication) show-stopper, stopper - an act so striking or impressive that the show must be delayed until the audience quiets down;
is a kind of act, bit, number, routine, turn

• showstopper(n = noun.attribute) show-stopper - something that is strikingly attractive or has great popular appeal; "she has a show-stopper of a smile"; "the brilliant orange flowers against the green foliage were a showstopper"
is a kind of attraction, attractiveness