voltage vs emf

voltage and emf both are nouns.

Word	Noun	Adjective	Verb	Adverb
voltage	Yes	No	No	No
emf	Yes	No	No	No

As nouns, voltage and emf are synonyms defined as:

voltage and emf: the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts

Other synonyms of voltage include electromotive force.

voltage (noun)	emf (noun)
the difference in electrical charge between two points in a circuit expressed in volts	the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts
the rate at which energy is drawn from a source that produces a flow of electricity in a circuit; expressed in volts