rheostat

acrobat, aerobat, aerostat, alley cat, apparat, Ararat, arrive at, assignat, autocrat, Automat, bell the cat, big brown bat, bureaucrat, butterfat, caveat, cervelat, chew the fat, civet cat, concordat, coolie hat, copycat, cowboy hat, democrat, diplomat, Dixiecrat, Eurocrat, fungo bat, habitat, hang one's hat, jungle cat, Kattegat, kleptocrat, Laundromat, leopard cat, marrowfat, mobocrat, monocrat, Montserrat, Norway rat, ochlocrat, off the bat, opera hat, pas de quatre, Persian cat, photostat, pit-a-pat, plutocrat, poke fun at, pussycat, railroad flat, rat-a-tat, scaredy-cat, semimatte, shovel hat, smell a rat, spoonbill cat, take aim at, technocrat, theocrat, thermostat, tiger cat, Uniate, vampire bat, water rat, welcome mat, where it's at, ziggurat