Countries Nouns and Adjectives with Duplicate Endings -- in American English

Or Near Duplicates (Numbers 7 and 8 Below)

#	Country	Noun Singular	Noun Plural	Adjective
1.	Dominica	Dominican	Dominicans	Dominican
2.	Dominican Republic	Dominican	Dominicans	Dominican
3.	Guernsey	Channel Islander	Channel Islanders	Channel Islander
4.	Jersey	Channel Islander	Channel Islanders	Channel Islander
5.	Korea, North	Korean	Koreans	Korean
6.	Korea, South	Korean	Koreans	Korean
7.	Niger	Nigerien	Nigeriens	Nigerien
8.	Nigeria	Nigerian	Nigerians	Nigerian