drooping vs weeping

drooping is not a noun while weeping is a noun.

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

As adjectives, drooping and weeping are synonyms defined as:

drooping and weeping: having branches or flower heads that bend downward

Other synonyms of drooping include cernuous, nodding, pendulous.

drooping (noun)	weeping (noun)
	the process of shedding tears (usually accompanied by sobs or other inarticulate sounds)

drooping (adjective)	weeping (adjective)
hanging down (as from exhaustion or weakness)	showing sorrow
weak from exhaustion	having branches or flower heads that bend downward
having branches or flower heads that bend downward