sound out vs check out

sound out and check out both are verbs.

Word	Noun	Adjective	Verb	Adverb
sound out	No	No	Yes	No
check out	No	No	Yes	No

As verbs, sound out and check out are synonyms defined as:

Other synonyms of sound out include feel out.

sound out (verb)	check out (verb)
try to learn someone's opinions and intentions	examine so as to determine accuracy, quality, or condition
speak, pronounce, or utter in a certain way	announce one's departure from a hotel
	try to learn someone's opinions and intentions
	record, add up, and receive payment for items purchased
	withdraw money by writing a check
	trace
	be verified or confirmed; pass inspection