decision maker de·ci·sion·maker US/dɪˈsɪʒʌˌnmeɪkɜr/ uncommon noun 1. someone who administers a business Synonymsadministratordecision maker Related words Word family administrate Broader terms head Narrower terms academic administratordirectorexecutivehotelierland agentsecurity directorvice chancellor WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.