The word scoff is both a noun and a verb.
The noun scoff is a word for an expression of scornful derision.
The verb scoff is to speak in a scornfully derisive or mocking way.
Examples:
"He delivered a scoff that took the smiles off all of our faces. (noun)
"Most people who live in nearby communities scoff at the town's local superstitions." (verb)
"The principal would invariably scoff at the faculty's ideas to improve the school."
"While many believe that the Loch Ness monster is a real creature, others scoff at the idea."