ABOLITIONIST
abolitionist, emancipationist
(noun) a reformer who favors abolishing slavery
Source: WordNet® 3.1
Etymology
Adjective
abolitionist (comparative more abolitionist, superlative most abolitionist)
(historical) In favor of the abolition of slavery. [since the late 18th century]
Noun
abolitionist (plural abolitionists)
A person who favors the abolition of any particular institution or practice. [since the late 18th century]
(historical, US) A person who favored or advocated the abolition of slavery. [since the late 18th century]
Source: Wiktionary
Ab`o*li"tion*ist, n.
Definition: A person who favors the abolition of any institution,
especially negro slavery.
Source: Webster’s Unabridged Dictionary 1913 Edition