sack vs clean out

sack is a noun but clean out is not a noun.

Word	Noun	Adjective	Verb	Adverb
sack	Yes	No	Yes	No
clean out	No	No	Yes	No

As verbs, clean out is a hyponym of sack; that is, clean out is a word with a more specific, narrower meaning than sack:

Other hyponyms of sack include retire, pension off, furlough, lay off, squeeze out, dismiss, drop, send away, send packing.

sack (noun)	clean out (noun)
the termination of someone's employment (leaving them free to depart)
the plundering of a place by an army or mob; usually involves destruction and slaughter
a bag made of paper or plastic for holding customer's purchases
a loose-fitting dress hanging straight from the shoulders without a waist
a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily
a woman's full loose hiplength jacket
any of various light dry strong white wine from Spain and Canary Islands (including sherry)
the quantity contained in a sack
an enclosed space

sack (verb)	clean out (verb)
put in a sack	empty completely
plunder (a town) after capture	deprive completely of money or goods
make as a net profit	to eject from somewhere
terminate the employment of; discharge from an office or position