The term 'Troublesome CRITTER' can be broken down into two words, 'VARMINT' and 'CRITTER'. VARMINT is a 7-letter word which is defined as an animal that is considered to be a nuisance or a pest. It is often used to refer to small mammals such as rats, mice, and squirrels. CRITTER is a term used to refer to any small creature, usually an animal, but can also be used to refer to insects. Therefore, the term 'Troublesome CRITTER' can be used to describe any small creature that causes trouble or is a nuisance.