Unionist (noun)

A person who advocates or supports unionism (the desire for a unified Ireland).

Origin:

Late 17th century; earliest use found in edward chamberlayne (1616–1703), royalist and writer. from union + -ist.

Examples:

1. He was a strong unionist and believed that Northern Ireland should remain part of the United Kingdom.
2. The unionist party has consistently opposed any moves towards Irish reunification.
3. Unionists have argued that a united Ireland would threaten the stability of the region.
4. Many unionists see themselves as the guardians of Protestant traditions and values.
5. Unionists often feel that their cultural identity is threatened by the growth of Irish nationalism.