Infestation
Part of speech: noun
Definition: The presence of a large number of pest organisms in an area or field, on the surface of a host or anything that might contact a host, or in the soil.
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: The competent programmer is fully aware of the limited size of his own skull. He therefore approaches his task with full humility, and avoids clever tricks like the plague.