The term KIN OF -ESS can be solved by two crossword solutions, ENNE (4 letters) and ETTE (4 letters). ENNE is a French suffix that is used to denote a female relative, such as a niece or cousin. Similarly, ETTE is also a French suffix that is used to denote a female relative, such as an aunt or sister. Both ENNE and ETTE are commonly used in French-speaking countries to refer to female relatives.