medical bill vs invoice

medical bill and invoice both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical bill	Yes	No	No	No
invoice	Yes	No	Yes	No

As nouns, invoice is a hypernym of medical bill; that is, invoice is a word with a broader meaning than medical bill:

medical bill: statement of charges for medical services
invoice: an itemized statement of money owed for goods shipped or services rendered

Other hypernyms of medical bill include account, bill.

medical bill (noun)	invoice (noun)
statement of charges for medical services	an itemized statement of money owed for goods shipped or services rendered

medical bill (verb)	invoice (verb)
	send a bill to