是名词词类的。

n. 嗜好；业余爱好My mother's hobby is playing the piano.我妈妈的业余爱好是弹钢琴。This hobby is catching dragonflies.这只小鹰正在捕捉蜻蜓。After communication, I found that I had the same hobby as him.经过交流，我发现我跟他竟然有相同的爱好。Angela's hobby is restoring vintage motorcycles.安吉拉的业余爱好是修复老爷摩托车I only play jazz as a hobby.我弹奏爵士乐只是一种业余爱好My grandfather's favorite hobby is betting on horse races.我爷爷的爱好是赌马。I picked up a new hobby last month.我上个月培养了一个新的爱好。