From Longman Business Dictionary
amateuram·a·teur /ˈæmətə, -tʃʊə, -tʃə, ˌæməˈtɜːˈæmətʃʊr, -tər/ noun [countableC] someone who does an activity for pleasure, not as a jobHe thinks the drawings could be the work of an amateur.
—amateur adjectiveadjamateur photographers