retire vs cast away

retire and cast away both are verbs.

Word	Noun	Adjective	Verb	Adverb
retire	No	No	Yes	No
cast away	No	No	Yes	No

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

retire (verb)	cast away (verb)
prepare for sleep	throw or cast away
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