<p>soda is definintely not an adjective. it would be as much of a noun as pop.</p>
<p>It's called "fizzy" where I come from.</p>
<p>Nah, I totally made that up. Sounds stupid.</p>
<p>"POP" is a yankee term often used up north. Where I am from, everything is a coke, even a crush drink. They say in the south, "Y'all want a coke?"</p>