woodlouse(n = noun.animal) slater - any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats;
is a kind of isopod
has particulars: pill bug, sow bug

woodlouse, n. (pl. -lice) any small terrestrial isopod crustacean of the genus Oniscus etc. feeding on rotten wood etc. and often able to roll into a ball.