extend vs stretch out

extend and stretch out both are verbs.

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

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

Other hyponyms of extend include spread-eagle, crane.

As verbs, extend and stretch out are synonyms defined as:

Other synonyms of extend include exsert, hold out, put out, stretch forth.

As verbs, extend and stretch out are synonyms defined as:

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

Other synonyms of extend include stretch, unfold.

extend (verb)	stretch out (verb)
extend one's limbs or muscles, or the entire body	stretch (the neck) so as to see better
thrust or extend out	thrust or extend out
extend in scope or range or area	extend one's body or limbs
lengthen in time; cause to be or last longer	extend or stretch out to a greater or the full length
continue or extend	lie down comfortably
expand the influence of
increase in quantity or bulk by adding a cheaper substance
prolong the time allowed for payment of
use to the utmost; exert vigorously or to full capacity
open or straighten out; unbend
extend or stretch out to a greater or the full length
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