hobby

(noun) an auxiliary activity. Synonyms: avocation, by-line, pursuit, sideline, spare-time activity.

(noun) a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride. Synonyms: hobbyhorse, rocking horse.

(noun) small Old World falcon formerly trained and flown at small birds. Synonyms: Falco subbuteo.