heart rate vs pulse rate

heart rate and pulse rate both are nouns.

Word	Noun	Adjective	Verb	Adverb
heart rate	Yes	No	No	No
pulse rate	Yes	No	No	No

As nouns, heart rate and pulse rate are synonyms defined as:

heart rate and pulse rate: the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health

Other synonyms of heart rate include pulse.

heart rate (noun)	pulse rate (noun)
the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health	the rate at which the heart beats; usually measured to obtain a quick evaluation of a person's health