crying vs sob

crying and sob both are nouns.

Word	Noun	Adjective	Verb	Adverb
crying	Yes	Yes	No	No
sob	Yes	No	Yes	No

As nouns, sob is a hyponym of crying; that is, sob is a word with a more specific, narrower meaning than crying:

crying: the process of shedding tears (usually accompanied by sobs or other inarticulate sounds)
sob: convulsive gasp made while weeping

Other hyponyms of crying include snivel, sniveling, sobbing, bawling, wailing.

crying (noun)	sob (noun)
the process of shedding tears (usually accompanied by sobs or other inarticulate sounds)	convulsive gasp made while weeping

crying (adjective)	sob (adjective)
conspicuously and outrageously bad or reprehensible
demanding attention

crying (verb)	sob (verb)
	weep convulsively