hit the sack vs turn in

hit the sack and turn in both are verbs.

Word	Noun	Adjective	Verb	Adverb
hit the sack	No	No	Yes	No
turn in	No	No	Yes	No

As verbs, hit the sack and turn in are synonyms defined as:

Other synonyms of hit the sack include bed, crawl in, go to bed, go to sleep, hit the hay, kip down, retire, sack out.

hit the sack (verb)	turn in (verb)
prepare for sleep	prepare for sleep
	carry out (performances)
	make an entrance by turning from a road
	to surrender someone or something to another