sideline vs demote

sideline is a noun but demote is not a noun.

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

As verbs, demote is a hypernym of sideline; that is, demote is a word with a broader meaning than sideline:

sideline: remove from the center of activity or attention; place into an inferior position
demote: assign to a lower position; reduce in rank

Other hypernyms of sideline include break, bump, kick downstairs, relegate.

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

sideline (verb)	demote (verb)
remove from the center of activity or attention; place into an inferior position	assign to a lower position; reduce in rank