cry vs cry out

cry is a noun but cry out is not a noun.

Word	Noun	Adjective	Verb	Adverb
cry	Yes	No	Yes	No
cry out	No	No	Yes	No

As verbs, cry and cry out are synonyms defined as:

Other synonyms of cry include call out, exclaim, outcry, shout.

cry (noun)	cry out (noun)
a loud utterance; often in protest or opposition
a fit of weeping
a slogan used to rally support for a cause
a loud utterance of emotion (especially when inarticulate)
the characteristic utterance of an animal

cry (verb)	cry out (verb)
shed tears because of sadness, rage, or pain	utter aloud; often with surprise, horror, or joy
bring into a particular state by crying
utter a sudden loud cry
proclaim or announce in public
utter a characteristic sound
utter aloud; often with surprise, horror, or joy
demand immediate action