extend vs extension

extend is not a noun while extension is a noun.

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

extend (noun)	extension (noun)
	an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
	act of stretching or straightening out a flexed limb
	act of expanding in scope; making more widely available
	an addition that extends a main building
	an addition to the length of something
	an additional telephone set that is connected to the same telephone line
	amount or degree or range to which something extends
	the ability to raise the working leg high in the air
	the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
	a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
	the spreading of something (a belief or practice) into new regions
	a mutually agreed delay in the date set for the completion of a job or payment of a debt

extend (verb)	extension (verb)
extend one's limbs or muscles, or the entire body
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