Amateur is a synonym of prosumer.
As nouns the difference between amateur and prosumer
is that
amateur is while
prosumer is (buzzword) a person in postindustrial society who combines the economic roles of producer and consumer or
prosumer can be a serious, enthusiastic consumer: not professional (earning money), but of similar interest and skills to a (generally lower level) professional, or aspiring to such the target market of
prosumer equipment.
As an adjective prosumer is
(marketing|of a consumer product) targeted at serious, enthusiastic consumers, incorporating professional features but often modified for non-professional use.