calorie vs small calorie

calorie and small calorie both are nouns.

Word	Noun	Adjective	Verb	Adverb
calorie	Yes	No	No	No
small calorie	Yes	No	No	No

As nouns, calorie and small calorie are synonyms defined as:

calorie and small calorie: unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure

Other synonyms of calorie include gram calorie.

calorie (noun)	small calorie (noun)
unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure	unit of heat defined as the quantity of heat required to raise the temperature of 1 gram of water by 1 degree centigrade at atmospheric pressure