postponer vs delayer

postponer and delayer both are nouns.

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

As nouns, delayer is a hypernym of postponer; that is, delayer is a word with a broader meaning than postponer:

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

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