The term 'POUND PEST' is a combination of two words, 'POUND' and 'PEST'. The first word, 'POUND', refers to a unit of weight measurement, while the second word, 'PEST', refers to an organism that causes damage or annoyance. The crossword solution for this term is 'FLEA', which is a small, wingless insect that feeds on the blood of mammals and birds. Fleas are known to cause irritation and discomfort to their hosts, making them a common PEST.