medical bill vs doctor's bill

medical bill and doctor's bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical bill	Yes	No	No	No
doctor's bill	Yes	No	No	No

As nouns, medical bill and doctor's bill are synonyms defined as:

medical bill and doctor's bill: statement of charges for medical services

medical bill (noun)	doctor's bill (noun)
statement of charges for medical services	statement of charges for medical services