direct mailer vs distributor

direct mailer and distributor both are nouns.

Word	Noun	Adjective	Verb	Adverb
direct mailer	Yes	No	No	No
distributor	Yes	No	No	No

As nouns, distributor is a hypernym of direct mailer; that is, distributor is a word with a broader meaning than direct mailer:

direct mailer (noun)	distributor (noun)
a distributor who uses direct mail to sell merchandise	electrical device that distributes voltage to the spark plugs of a gasoline engine in the order of the firing sequence
	a company that markets merchandise
	someone who markets merchandise
	a person with authority to allot or deal out or apportion