mail out vs send

mail out and send both are verbs.

Word	Noun	Adjective	Verb	Adverb
mail out	No	No	Yes	No
send	No	No	Yes	No

As verbs, send is a hypernym of mail out; that is, send is a word with a broader meaning than mail out:

mail out: transmit by mail
send: to cause or order to be taken, directed, or transmitted to another place

Other hypernyms of mail out include send out.

mail out (verb)	send (verb)
transmit by mail	cause to be directed or transmitted to another place
	transfer
	broadcast over the airwaves, as in radio or television
	assign to a station
	to cause or order to be taken, directed, or transmitted to another place
	transport commercially
	cause to go somewhere
	cause to be admitted; of persons to an institution