continue vs prolong

continue and prolong both are verbs.

Word	Noun	Adjective	Verb	Adverb
continue	No	No	Yes	No
prolong	No	No	Yes	No

As verbs, prolong is a hypernym of continue; that is, prolong is a word with a broader meaning than continue:

continue: allow to remain in a place or position or maintain a property or feature
prolong: lengthen or extend in duration or space

Other hypernyms of continue include keep up, sustain.

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

continue (verb)	prolong (verb)
exist over a prolonged period of time	lengthen in time; cause to be or last longer
continue talking	lengthen or extend in duration or space
move ahead; travel onward in time or space
allow to remain in a place or position or maintain a property or feature
keep or maintain in unaltered condition; cause to remain or last
continue a certain state, condition, or activity
span an interval of distance, space or time
continue in a place, position, or situation
continue after an interruption
do something repeatedly and showing no intention to stop