groupie

As nouns the difference between rat and groupie

is that rat is a medium-sized rodent belonging to the genus Rattus while groupie is a young female fan of a rock group; a person who seeks intimacy (most often physical, sometimes emotional) with a famous person, usually a rock band member.

As a verb rat

is to betray someone and tell their secret to an authority or an enemy; to turn someone in, bewray.

As nouns the difference between taxonomy and groupie

is that taxonomy is the science or the technique used to make a classification while groupie is a young female fan of a rock group; a person who seeks intimacy (most often physical, sometimes emotional) with a famous person, usually a rock band member.