An "ordered pair" pings the "fixed phrase" part of my mind. A "list", strictly speaking, implies a data structure in which order is preserved. However, people can use lists for data where order is irrelevant, to represent a bag (or even a set), so there's an ambiguity there. A "collection" is a very general concept, so there's vagueness there.
I think that for me the problem with "list" is that it's both a formal term for a particular data structure and an informal term for a bunch of items, so that a list{2} may or may not be stored in a list{1}, and it seems entirely possible that one's default parse for "ordered list" might depend on which sense came to mind first.
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An "ordered pair" pings the "fixed phrase" part of my mind.
A "list", strictly speaking, implies a data structure in which order is preserved. However, people can use lists for data where order is irrelevant, to represent a bag (or even a set), so there's an ambiguity there.
A "collection" is a very general concept, so there's vagueness there.