protracted vs prolonged

protracted and prolonged both are adjectives.

Word	Noun	Adjective	Verb	Adverb
protracted	No	Yes	No	No
prolonged	No	Yes	No	No

As adjectives, protracted and prolonged are synonyms defined as:

protracted and prolonged: relatively long in duration; tediously protracted

Other synonyms of protracted include drawn-out, extended, lengthy.

protracted (adjective)	prolonged (adjective)
relatively long in duration; tediously protracted	drawn out or made longer spatially
	relatively long in duration; tediously protracted