pack rat vs trade rat

pack rat and trade rat both are nouns.

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

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

pack rat 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 pack rat include bushytail woodrat, Neotoma cinerea, packrat.

pack rat (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
someone who collects things that have been discarded by others