Hi, can you please explain if in finance (specifically as related stocks and bonds) are the terms:

1) payment,

2) coupon, and

3) discount

all synonymous? I really have a hard time in finance, as I feel like a lot of terms are used interchangeably but are not identified as meaning the same thing. I guess they assume it's intuitive, but not so for me. :-)

Another question similar to this is, are

1) total return,

2) required rate of return, and

3) stockholder's required return

all synonymous? Thanks in advance for helping me to grasp this terminology better!