assign vs demote

assign and demote both are verbs.

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

As verbs, demote is a hyponym of assign; that is, demote is a word with a more specific, narrower meaning than assign:

assign: give an assignment to (a person) to a post, or assign a task to (a person)
demote: assign to a lower position; reduce in rank

assign (verb)	demote (verb)
select something or someone for a specific purpose	assign to a lower position; reduce in rank
attribute or credit to
decide as to where something belongs in a scheme
attribute or give
transfer one's right to
give out
make undue claims to having
give an assignment to (a person) to a post, or assign a task to (a person)