extend vs stud

extend is not a noun while stud is a noun.

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

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

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

extend (noun)	stud (noun)
	poker in which each player receives hole cards and the remainder are dealt face up; bets are placed after each card is dealt
	adult male horse kept for breeding
	an upright in house framing
	ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)
	a man who is virile and sexually active

extend (verb)	stud (verb)
extend one's limbs or muscles, or the entire body	provide with or construct with studs
thrust or extend out	scatter or intersperse like dots or studs
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