acknowledge vs receipt

acknowledge is not a noun while receipt is a noun.

Word	Noun	Adjective	Verb	Adverb
acknowledge	No	No	Yes	No
receipt	Yes	No	Yes	No

As verbs, acknowledge and receipt are synonyms defined as:

acknowledge (noun)	receipt (noun)
	the act of receiving
	an acknowledgment (usually tangible) that payment has been made

acknowledge (verb)	receipt (verb)
accept as legally binding and valid	mark or stamp as paid
accept (someone) to be what is claimed or accept his power and authority	report the receipt of
declare to be true or admit the existence or reality or truth of
express obligation, thanks, or gratitude for
report the receipt of
express recognition of the presence or existence of, or acquaintance with