pack rat

(noun) someone who collects things that have been discarded by others. Synonyms: magpie, scavenger.

(noun) any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects. Synonyms: packrat, trade rat, bushytail woodrat, Neotoma cinerea.

(noun) a collector of miscellaneous useless objects. Synonyms: packrat.