mailer vs mail

mailer and mail both are nouns.

Word	Noun	Adjective	Verb	Adverb
mailer	Yes	No	No	No
mail	Yes	No	Yes	No

mailer (noun)	mail (noun)
a container for something to be mailed	(Middle Ages) flexible armor made of interlinked metal rings
an advertisement that is sent by mail	a conveyance that transports the letters and packages that are conveyed by the postal system
a person who mails something	the system whereby messages are transmitted via the post office
	the bags of letters and packages that are transported by the postal service
	any particular collection of letters or packages that is delivered

mailer (verb)	mail (verb)
	cause to be directed or transmitted to another place
	send via the postal service