assign vs kick upstairs

assign and kick upstairs both are verbs.

Word	Noun	Adjective	Verb	Adverb
assign	No	No	Yes	No
kick upstairs	No	No	Yes	No

As verbs, kick upstairs is a hyponym of assign; that is, kick upstairs 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)
kick upstairs: give a promotion to or assign to a higher position

assign (verb)	kick upstairs (verb)
select something or someone for a specific purpose	give a promotion to or assign to a higher position
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)