retire vs close down

retire and close down both are verbs.

Word	Noun	Adjective	Verb	Adverb
retire	No	No	Yes	No
close down	No	No	Yes	No

As verbs, close down is a hypernym of retire; that is, close down is a word with a broader meaning than retire:

Other hypernyms of retire include close, close up, fold, shut down.

retire (verb)	close down (verb)
prepare for sleep	cease to operate or cause to cease operating
cause to get out
cause to be out on a fielding play
lose interest
pull back or move away or backward
dispose of (something no longer useful or needed)
break from a meeting or gathering
go into retirement; stop performing one's work or withdraw from one's position
withdraw from active participation
make (someone) retire
withdraw from circulation or from the market, as of bills, shares, and bonds