delayer vs postponer

delayer and postponer both are nouns.

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

As nouns, postponer is a hyponym of delayer; that is, postponer is a word with a more specific, narrower meaning than delayer:

delayer: a person who delays; to put off until later or cause to be late
postponer: someone who postpones work (especially out of laziness or habitual carelessness)

Other hyponyms of delayer include filibuster, filibusterer, cunctator, procrastinator, temporiser, temporizer.

delayer (noun)	postponer (noun)
a person who delays; to put off until later or cause to be late	someone who postpones work (especially out of laziness or habitual carelessness)