sobbing vs weeping

sobbing and weeping both are nouns.

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

As nouns, weeping is a hypernym of sobbing; that is, weeping is a word with a broader meaning than sobbing:

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

Other hypernyms of sobbing include crying, tears.

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

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