gentilic
/ˈdʒɛntɪlɪk/ or /ˈdʒɛntɪlɪk/ (UK) or /ʒɛnˈtɪlɪk/ (US)
Definitions
1. noun
A term or expression used by a particular ethnic or national group to describe itself or its language.
“The term ‘gentilic’ is used in linguistics to describe the names of ethnic groups.”
2. adjective
Relating to the names or terms used by particular ethnic or national groups to describe themselves.
“The gentilic terms used in a particular region were studied by the anthropologist.”