reformationist
/ˌrɛfəˈmeɪʃ(ə)nɪst/ /ˌrɛfəˈmeɪʃənɪst/noun
A supporter or advocate of the religious principles of the Reformation; (also occasionally more generally) a person who supports or advocates reform, a reformer.
adjective
Of or relating to the Reformation or its supporters; (more generally) that supports or advocates reform, reformist.
Origin
Early 19th century; earliest use found in Cobbett's Weekly Political Register. From reformation + -ist.