Exclamation: a sharp or sudden utterance, or a spoken interjection.
Examples:
In a sentence: Lily's song was interrupted many times by rude exclamations from her enemy, Biff.
An exclamation itself: "Hey you! Come back!"
Parenthesis: an amplifying or explanatory word, phrase, or sentence, inserted in a passage from which is usually set off by punctuation; remark or passage that departs from theme of discourse; one or both of the curved marks ( ) used in writing and printing to enclose a parenthetical expression or to group a symbolic unit in a logical or mathematical expression