expectancy vs expect

expectancy is a noun but expect is not a noun.

Word	Noun	Adjective	Verb	Adverb
expectancy	Yes	No	No	No
expect	No	No	Yes	No

expectancy (noun)	expect (noun)
something expected (as on the basis of a norm)
an expectation

expectancy (verb)	expect (verb)
	be pregnant with
	look forward to the birth of a child
	regard something as probable or likely
	look forward to the probable occurrence of
	consider reasonable or due
	consider obligatory; request and expect