pronghorn vs American antelope

pronghorn and American antelope both are nouns.

Word	Noun	Adjective	Verb	Adverb
pronghorn	Yes	No	No	No
American antelope	Yes	No	No	No

As nouns, pronghorn and American antelope are synonyms defined as:

pronghorn and American antelope: fleet antelope-like ruminant of western North American plains with small branched horns

Other synonyms of pronghorn include Antilocapra americana, prongbuck, pronghorn antelope.

pronghorn (noun)	American antelope (noun)
fleet antelope-like ruminant of western North American plains with small branched horns	fleet antelope-like ruminant of western North American plains with small branched horns