rocking horse vs hobby

rocking horse and hobby both are nouns.

Word	Noun	Adjective	Verb	Adverb
rocking horse	Yes	No	No	No
hobby	Yes	No	No	No

As nouns, rocking horse and hobby are synonyms defined as:

rocking horse and hobby: a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride

Other synonyms of rocking horse include hobbyhorse.

rocking horse (noun)	hobby (noun)
a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride	an auxiliary activity
	small Old World falcon formerly trained and flown at small birds
	a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride