From Longman Dictionary of Contemporary Englishscoutmasterscout‧mas‧ter /ˈskaʊtˌmɑːstə $ -ˌmæstər/ noun [countable]DLCa man who is the leader of a group of Scouts
Examples from the Corpus
scoutmaster• Served as a scoutmaster in Greenwich and Dallas.• Sculley assumed the role of scoutmaster.