Pest
Part of speech: noun
Definition: A plague, pestilence, epidemic An annoying, harmful, often destructive creature. An annoying person. Someone with poor social discipline who continually bothers disinterested women.
Example sentence: I was getting bored and, I think, being a real pest. I remember Brando coming and sitting on the bed and cutting out the most exquisite paper fish, with detailed scales and fins. Then he took a hotel pen and a piece of string and made a fishing pole.
Plague
Part of speech: verb
Definition: To harass, pester or annoy someone persistently or incessantly.To afflict with a disease or other calamity.
Part of speech: noun
Definition: (used absolutely, usually capitalized: The Pest) The pestilent disease "Plague", caused by the virulent bacterium Yersinia pestis and mostly known by its variant form bubonic plague.An epidemic or pandemic caused by any pestilence, but specifically by the above disease.A widespread affliction, calamity or destructive influx, especially when seen as divine retribution.A grave nuisance, whatever greatly irritates
Example sentence: If you lose a big fight, it will worry you all of your life. It will plague you - until you get your revenge.