tease

苛める(いじめる)	Bully someone, verbally or physically. $$$

ちゃかす	To take something that someone just said in earnest, and turn it into a joking matter.

ふざける	Joke around with, usu. In a friendly way

冷やかす(ひやかす)	Tease, usually about “Oooh, Sammy’s got a giiiirlfriend!” “No I don’t!!” “yes you dooo!”

からかう	Mess with someone’s head.

嫌がらせ(いやがらせ)	Harass in a stalker manner.