Payor vs. Payer: What's the Difference?

Payor and Payer Definitions
Payor
Variant of payer.
Payer
One that pays
A prompt payer of bills.
Payor
One who makes a payment.
Payer
One named responsible for paying a bill or note.
Payor
See Payer.
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Payer
One who pays; specifically, the person by whom a bill or note has been, or should be, paid.
Payer
(finance) A swaption which gives its holder the option to enter into a swap in which they pay the fixed leg and receive the floating leg.
Payer
One who pays; specifically, the person by whom a bill or note has been, or should be, paid.
Payer
A person who pays money for something