express-mail vs send

express-mail and send both are verbs.

Word	Noun	Adjective	Verb	Adverb
express-mail	No	No	Yes	No
send	No	No	Yes	No

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

Other hypernyms of express-mail include mail, post.

express-mail (verb)	send (verb)
send by express mail or courier	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