packrat vs trade rat

packrat and trade rat both are nouns.

Word	Noun	Adjective	Verb	Adverb
packrat	Yes	No	No	No
trade rat	Yes	No	No	No

As nouns, packrat and trade rat are synonyms defined as:

packrat and trade rat: any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects

Other synonyms of packrat include bushytail woodrat, Neotoma cinerea, pack rat.

packrat (noun)	trade rat (noun)
any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects	any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects
a collector of miscellaneous useless objects