postponer vs procrastinator

postponer and procrastinator both are nouns.

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

As nouns, postponer and procrastinator are synonyms defined as:

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

Other synonyms of postponer include cunctator.

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