1) Alternates 2) Replacers 3) Sits in 4) Standbys 5) Stand ins 6) Swaps 7) Takestheplaceof 1) Fill-ins 
Substitute goods are often termed as having competitive demand. The consumer can swap between the two goods and maintain the same degree of satisfaction. Some goods have very close substitutes, while others do not. An indication of the goods being substitutes is the cross price elasticity of demand. If the CPED is positive then the two goods are su...