prolongation vs lengthiness

prolongation and lengthiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
prolongation	Yes	No	No	No
lengthiness	Yes	No	No	No

As nouns, prolongation and lengthiness are synonyms defined as:

prolongation and lengthiness: amount or degree or range to which something extends

Other synonyms of prolongation include extension.

As nouns, prolongation and lengthiness are synonyms defined as:

prolongation and lengthiness: the consequence of being lengthened in duration

Other synonyms of prolongation include continuation, protraction.

prolongation (noun)	lengthiness (noun)
the act of prolonging something	amount or degree or range to which something extends
amount or degree or range to which something extends	the consequence of being lengthened in duration
the consequence of being lengthened in duration