convert
noun
°A person who has converted his or her religion.
"They were all converts to Islam."
°A person who is now in favour of something that he or she previously opposed or disliked.
"I never really liked broccoli before, but now that I've tasted it the way you cook it, I'm a convert!"
verb
°To transform or change (something) into another form, substance, state, or product.
"A kettle converts water into steam."
°To change (something) from one use, function, or purpose to another.
"He converted his garden into a tennis court."