droop vs sag

droop and sag both are nouns.

Word	Noun	Adjective	Verb	Adverb
droop	Yes	No	Yes	No
sag	Yes	No	Yes	No

As nouns, droop and sag are synonyms defined as:

As verbs, droop and sag are synonyms defined as:

droop and sag: droop, sink, or settle from or as if from pressure or loss of tautness

Other synonyms of droop include flag, swag.

droop (noun)	sag (noun)
a shape that sags	a shape that sags

droop (verb)	sag (verb)
become limp	droop, sink, or settle from or as if from pressure or loss of tautness
droop, sink, or settle from or as if from pressure or loss of tautness	cause to sag
hang loosely or laxly