sideline vs hobby

sideline and hobby both are nouns.

Word	Noun	Adjective	Verb	Adverb
sideline	Yes	No	Yes	No
hobby	Yes	No	No	No

As nouns, sideline and hobby are synonyms defined as:

Other synonyms of sideline include avocation, by-line, pursuit, spare-time activity.

sideline (noun)	hobby (noun)
an auxiliary activity	an auxiliary activity
an auxiliary line of merchandise	small Old World falcon formerly trained and flown at small birds
a line that marks the side boundary of a playing field	a child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride

sideline (verb)	hobby (verb)
remove from the center of activity or attention; place into an inferior position