Verb: When used as a verb, "tease" means to annoy or make fun of someone playfully or cruelly.
*Example: "Don't tease your little brother like that."
Noun: When used as a noun, "tease" refers to an act of teasing or a person who teases.
*Example: "He gave me a playful tease about my new haircut."
*Example: "She's a real tease!"