The term 'closely related' can be described by the crossword solutions of TRIBE (5 letters), SLOVAK (6 letters), AKIN (4 letters), CREE (4 letters) and SIAMESE (7 letters). TRIBE refers to a group of people who share a common ancestry, culture, language, and history. SLOVAK is an ethnic group from Central Europe, primarily in Slovakia. AKIN is a word used to describe something that is similar or related. CREE is an indigenous North American TRIBE from Canada and the United States. SIAMESE is an ethnic group from Southeast Asia, primarily in Thailand. All of these terms refer to people who are closely related by ancestry, culture, language, and history.