stair，stairs，staircase，step，stairway这五个词都有楼梯的意思，有什么不同吗

stair，n.1. (阶梯等的)一级，梯级2. [用复数，用作单数或复数]阶梯，楼梯3. [用复数]【船舶学】浮动平台4. 阶梯，途径stair [stεə] n. 英语解释：support consisting of a place to rest the foot while ascending or descending a stairwaystairs——是stair的复数形式。staircase ['stεəkeis] n.楼梯；楼梯间【即可指“楼梯”，还可指“设置楼梯的房间部分”】英语解释：a way of access (upward and downward) consisting of a set of stepsstairwayn.【建筑专业用词】 阶梯，楼梯英语解释：a way of access (upward and downward) consisting of a set of steps当然，指代“台阶，阶梯”时，stair与step一般可互换。