procrastinator vs postponer

procrastinator and postponer both are nouns.

Word	Noun	Adjective	Verb	Adverb
procrastinator	Yes	No	No	No
postponer	Yes	No	No	No

As nouns, procrastinator and postponer are synonyms defined as:

procrastinator and postponer: someone who postpones work (especially out of laziness or habitual carelessness)

Other synonyms of procrastinator include cunctator.

procrastinator (noun)	postponer (noun)
someone who postpones work (especially out of laziness or habitual carelessness)	someone who postpones work (especially out of laziness or habitual carelessness)