sumpter vs pack animal

sumpter and pack animal both are nouns.

Word	Noun	Adjective	Verb	Adverb
sumpter	Yes	No	No	No
pack animal	Yes	No	No	No

As nouns, sumpter and pack animal are synonyms defined as:

sumpter and pack animal: an animal (such as a mule or burro or horse) used to carry loads

sumpter (noun)	pack animal (noun)
an animal (such as a mule or burro or horse) used to carry loads	an animal (such as a mule or burro or horse) used to carry loads