extend vs overspread

extend and overspread both are verbs.

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

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

Other hyponyms of extend include cross, span, sweep, traverse, sweep, overlap, spread, ridge, constellate, dot, stud.

extend (verb)	overspread (verb)
extend one's limbs or muscles, or the entire body	spread across or over
thrust or extend out
extend in scope or range or area
lengthen in time; cause to be or last longer
continue or extend
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