metabolic rate vs BMR

metabolic rate and BMR both are nouns.

Word	Noun	Adjective	Verb	Adverb
metabolic rate	Yes	No	No	No
BMR	Yes	No	No	No

As nouns, BMR is a hyponym of metabolic rate; that is, BMR is a word with a more specific, narrower meaning than metabolic rate:

metabolic rate: rate of metabolism; the amount of energy expended in a give period
BMR: the rate at which heat is produced by an individual in a resting state

Other hyponyms of metabolic rate include basal metabolic rate.

metabolic rate (noun)	BMR (noun)
rate of metabolism; the amount of energy expended in a give period	the rate at which heat is produced by an individual in a resting state