extend vs hyperextend

extend and hyperextend both are verbs.

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

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

extend (verb)	hyperextend (verb)
extend one's limbs or muscles, or the entire body	extend a joint beyond its normal range
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