avocation
/ˌævəˈkeɪʃ(ə)n/Your avocation is a job or activity that you do because you are interested in it, rather than to earn your living. 业余爱好; 嗜好
noun [专属名词] 副业;业余爱好;嗜好
He was a printer by trade and naturalist by avocation. 他在印刷厂工作,同时是个博物学爱好者。