in·for·mant 
/ɪnˈfoɚmənt/ noun
plural in·for·mants /ɪnˈfoɚmənt/ noun [count] 1 : a person who gives information to the police about secret or criminal activities : informer
▪ The police were alerted to the plot by a paid informant. 2 technical : a person who gives information about his or her culture or language to a researcher
▪ We learned the language with the help of a native informant.
▪ The police were alerted to the plot by a paid informant.
▪ We learned the language with the help of a native informant.
