expectation vs expect

expectation is a noun but expect is not a noun.

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

expectation (noun)	expect (noun)
belief about (or mental picture of) the future
the sum of the values of a random variable divided by the number of values
the feeling that something is about to happen
anticipating with confidence of fulfillment

expectation (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