electrocardiography vs cardiography

electrocardiography and cardiography both are nouns.

Word	Noun	Adjective	Verb	Adverb
electrocardiography	Yes	No	No	No
cardiography	Yes	No	No	No

As nouns, electrocardiography and cardiography are synonyms defined as:

electrocardiography and cardiography: diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram)

electrocardiography (noun)	cardiography (noun)
diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram)	diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram)