altitude(1. In general, a term used to describe a topographic eminence. 2. A specific altitude or height above a given level. 3. In surveying, the term refers to the angle between the horizontal and a point at a higher level)
substitutability(character of a process or substance to be possibly substituded by a less harmful one; The capability of a substance of being replaced by another, for example sweeteners used in place of sugar; chemistry)