nationalist
noun
[ ˈnaʃ(ə)n(ə)lɪst ]
• a person who strongly identifies with their own nation and vigorously supports its interests, especially to the exclusion or detriment of the interests of other nations.
• "he was a staunch nationalist during his 22 years in power"
nationalist
adjective
• relating to nationalists or nationalism.
• "a nationalist movement"
