I think the correct term for these would be "profiles", at least with a Sweep they are called "profiles" and a sweep of course also has a "path".
The list in theory at least, only provides "valid" profiles but there are exceptions and complications, for example a vertex/point can only be a first or last profile not for example 2nd of 3.
I amend the suggestion to have the labels read:
On the lefthand Loft panel:
"Profiles available for Loft operation:
And the righthand Loft panel:
"Profiles selected for Loft
On the lefthand Sweep panel:
"Profiles available for Sweep operation:
And the righthand Sweep panel:
"Profile selected for Sweep