A stocker is a seven-letter term for someone who works in a store stocking shelves with merchandise. A DOG is a three-letter term for a domestic animal that is often kept as a PET. A CAT is another three-letter term for a domestic animal that is often kept as a PET. A PET is a three-letter term for an animal kept for companionship or pleasure. A nannygoat is a nine-letter term for a female goat kept for its milk, meat, or hide. All of these terms refer to domestic animals, which are animals that have been tamed and kept by humans for a variety of purposes.