avocation vs sideline

avocation and sideline both are nouns.

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

As nouns, avocation and sideline are synonyms defined as:

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

avocation (noun)	sideline (noun)
an auxiliary activity	an auxiliary activity
	an auxiliary line of merchandise
	a line that marks the side boundary of a playing field

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