There is a difference. Faygo is a soda. Coke is pop.
Speaking stricktly, that is. Bud is right in that I wouldn't blink twice for anyone calling Rock & Rye "pop." Soda pop, after all, Pony Boy! Stay golden.
...Faygo "Red" ...when I drank that stuff. I rarely drink pop now but when I do it's sprite.
...as for the term "pop", yeah i know it's soda but back when I was drinking Faygo we called it pop. The first time I heard someone call it a soda I thought they were referring to a float(soda/ice cream). (lol)