weeping vs sob

weeping and sob both are nouns.

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

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

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

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

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

weeping (adjective)	sob (adjective)
showing sorrow
having branches or flower heads that bend downward

weeping (verb)	sob (verb)
	weep convulsively