As verbs the difference between extended and heightened
is that extended is past tense of extend while heightened is past tense of heighten.
As adjectives the difference between extended and heightened
is that extended is longer in length or extension; elongated while heightened is increased in intensity or concentration; elevated, stepped-up.
extended
English
Verb
(head)
(extend)
Adjective
(
en adjective)
longer in length or extension; elongated
stretched out or pulled out; expanded
lasting longer; protracted
having a large scope or range; extensive
(of a typeface) wider than usual
heightened
English
Verb
(head)
(heighten)
Adjective
(
en adjective)
increased in intensity or concentration; elevated, stepped-up