duration vs stretch

duration and stretch both are nouns.

Word	Noun	Adjective	Verb	Adverb
duration	Yes	No	No	No
stretch	Yes	Yes	Yes	No

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

Other hyponyms of duration include clocking, longueur, residence time, span, stint, time scale, note value, time value, value, rule.

duration (noun)	stretch (noun)
continuance in time	exercise designed to extend the limbs and muscles to their full extent
the property of enduring or continuing in time	the act of physically reaching or thrusting out
the period of time during which something continues	extension to or beyond the ordinary limit
	a straightaway section of a racetrack
	the capacity for being stretched
	a large and unbroken expanse or distance
	an unbroken period of time during which you do something

duration (adjective)	stretch (adjective)
	easily stretched
	having an elongated seating area

duration (verb)	stretch (verb)
	extend one's limbs or muscles, or the entire body
	extend one's body or limbs
	become longer by being stretched and pulled
	make long or longer by pulling and stretching
	extend the scope or meaning of; often unduly
	increase in quantity or bulk by adding a cheaper substance
	corrupt, debase, or make impure by adding a foreign or inferior substance; often by replacing valuable ingredients with inferior ones
	pull in opposite directions
	extend or stretch out to a greater or the full length
	lie down comfortably
	occupy a large, elongated area