extend vs stretch

extend is not a noun while stretch is a noun.

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

As verbs, extend and stretch are synonyms defined as:

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

Other hyponyms of extend include broaden, territorialise, territorialize, globalise, globalize.

As verbs, extend and stretch are synonyms defined as:

extend and stretch: increase in quantity or bulk by adding a cheaper substance

As verbs, extend and stretch are synonyms defined as:

extend and stretch: extend or stretch out to a greater or the full length

Other synonyms of extend include stretch out, unfold.

extend (noun)	stretch (noun)
	exercise designed to extend the limbs and muscles to their full extent
	the act of physically reaching or thrusting out
	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

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

extend (verb)	stretch (verb)
extend one's limbs or muscles, or the entire body	extend one's limbs or muscles, or the entire body
thrust or extend out	extend one's body or limbs
extend in scope or range or area	become longer by being stretched and pulled
lengthen in time; cause to be or last longer	make long or longer by pulling and stretching
continue or extend	extend the scope or meaning of; often unduly
expand the influence of	increase in quantity or bulk by adding a cheaper substance
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
prolong the time allowed for payment of	pull in opposite directions
use to the utmost; exert vigorously or to full capacity	extend or stretch out to a greater or the full length
open or straighten out; unbend	lie down comfortably
extend or stretch out to a greater or the full length	occupy a large, elongated area
cause to move at full gallop
offer verbally
make available; provide
span an interval of distance, space or time
reach outward in space
stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point