i forgot what that was because the english language is so darn broken with it's grammar rules and stuff
things contradict things then bleh bleh bleh
onomatopoeia is a word-ization of a sound (bzzzz, hmph, chiing.) Interjection shows excitement, or emotion, and is generally set apart from a sentence by an exclamation point, or by a comma when the feelings not as strong.
"
Hey! That hurt."
"
Hey, that hurt."