Small common harmful or objectionable animals (such as lice or fleas) that are difficult to control. (Merriam – Webster)
Birds and mammals that prey on game. (Merriam – Webster)
Animals that at a particular time and place compete (as for food) with humans or domestic animals. (Merriam – Webster)
An offensive person. (Merriam – Webster)
Noxious, objectionable, or disgusting animals collectively, especially those of small size that appear commonly and are difficult to control, as flies, lice, bedbugs, cockroaches, mice, and rats. (Dictionary.com)
An objectionable or obnoxious person, or such persons collectively. (Dictionary.com)
Animals that prey upon game, as coyotes or weasels. (Dictionary.com)
Small animals and insects that can be harmful and are difficult to control when they appear in large numbers. (Cambridge Dictionary)
People who are unpleasant and harmful to society. (Cambridge Dictionary)
Insects parasites vermin nature.
Parasites and vermin on our bodies reveal secrets of human history.
Vermin on the mount.