Explain the role of verbs and nouns. Describe their usage and the most common ways they are misused?

A verb is an action word. - Eat, kill smile, think. - A noun is a naming word. Cat, Elephant, Interpolation, Instransigence.

With verbs, the worst misuse is with tenses (usually). I have seen "I eated it" when the correct form is "I ate it". Nouns are less misused, but are sometimes confused with verbs and vice versa. A common expression is "That's a big ask" - ask is a verb - what they probably meant was "That's a big question" - question is a noun. I'm sure you can think of even better examples.