sob vs crying

sob and crying both are nouns.

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

As nouns, crying is a hypernym of sob; that is, crying is a word with a broader meaning than sob:

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

Other hypernyms of sob include tears, weeping.

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

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

sob (verb)	crying (verb)
weep convulsively