any vs nth

any

• Any thing(s) or person(s). 

• One at all; at least one; at least one kind of; some; a positive quantity of. 

• No matter what kind. 

• To even the slightest extent, at all. 

nth

• Occurring at a relatively large but unspecified position in a series. 

• Occurring at position n in a sequence. 

• The item at position n in a sequence. 

• The item in a relatively large but unspecified position in a series.