toilet seat(n = noun.artifact) - the hinged seat on a toilet;
is a kind of seat
is a part of can, commode, crapper, pot, potty, stool, throne, toilet

back seat, balloon seat, bell seat, bicycle seat, box seat, bucket seat, car seat, country seat, county seat, death seat, ejection seat, ejector seat, flush toilet, flushless toilet, hot seat, jump seat, love seat, mercy seat, plane seat, potty seat, public toilet, ringside seat, rumble seat, seat, seat belt, seat cushion, sliding seat, tiered seat, toilet, toilet article, toilet bag, toilet bowl, toilet facility, toilet kit, toilet paper, toilet powder, toilet roll, toilet soap, toilet table, toilet tissue, toilet water, window seat