rat terrier(n = noun.animal) ratter - any of several breeds of terrier developed to catch rats;
is a kind of terrier
has particulars: black-and-tan terrier, manchester terrier

airedale terrier, american pit bull terrier, american staffordshire terrier, australian terrier, bandicoot rat, beaver rat, bedlington terrier, black rat, black rat snake, black-and-tan terrier, border terrier, boston terrier, brown rat, bull terrier, cairn terrier, cat and rat, chinchilla rat, clydesdale terrier, cotton rat, damaraland mole rat, dandie dinmont terrier, desert rat, dusky-footed wood rat, dwarf pocket rat, florida water rat, fox terrier, gym rat, indian rat snake, irish terrier, jerboa rat, kangaroo rat, kerry blue terrier, lakeland terrier, manchester terrier, marsupial rat, mole rat, naked mole rat, norfolk terrier, norway rat, norwich terrier, opossum rat, ord kangaroo rat, pack rat, pit bull terrier, pocket rat, pouched rat, queen mole rat, rat, rat cheese, rat chinchilla, rat kangaroo, rat race, rat snake, rat typhus, red rat snake, rice rat, roof rat, sand rat, scotch terrier, scottish terrier, sea rat, sealyham terrier, sewer rat, silky terrier, skye terrier, smooth-haired fox terrier, soft-coated wheaten terrier, staffordshire bull terrier, staffordshire terrier, terrier, tibetan terrier, toy manchester terrier, toy terrier, trade rat, water rat, welsh terrier, west highland white terrier, wharf rat, wire-haired fox terrier, wire-haired terrier, wirehaired terrier, wood rat, yorkshire terrier