scavenger vs pack rat

scavenger and pack rat both are nouns.

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

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

scavenger and pack rat: someone who collects things that have been discarded by others

Other synonyms of scavenger include magpie.

scavenger (noun)	pack rat (noun)
any animal that feeds on refuse and other decaying organic matter	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	someone who collects things that have been discarded by others
a chemical agent that is added to a chemical mixture to counteract the effects of impurities