stepfather
step‧fa‧ther /ˈstepfɑːðə $ -ər/ BrE AmE noun [countable]
a man who is married to your mother but who is not your father
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THESAURUS
▪ father a male parent: My father’s a doctor. | He’s a father of three.
▪ dad informal used when talking to your father, or about someone's father: Can I borrow your car, Dad? | Her dad retired ten years ago. | My dad was in the army.
▪ daddy a name for father, which is used especially by young children or when you are talking to young children: Where’s your daddy? | Daddy, can I have a drink, please?
▪ pop American English informal (also pa old-fashioned) used when talking to your father, or about someone's father: I helped Pop fix the gate this morning. | Can I help, Pa? | He is in New York with his Pop's credit card, eating all the ice cream and pizza the city has to offer.
▪ papa old-fashioned informal used when talking to your father, or about someone's father: Papa had forbidden me to go. | She saw her papa 's face change at this news.
▪ sb’s old man informal someone's father – used when talking about him in a way that is not very respectful: His old man wouldn’t let him use the car.
▪ stepfather (also stepdad informal) a man who is married to your mother, who is not your father but often acts as your parent: Her stepfather is really nice.