scavenger vs chemical agent

scavenger and chemical agent both are nouns.

Word	Noun	Adjective	Verb	Adverb
scavenger	Yes	No	No	No
chemical agent	Yes	No	No	No

As nouns, chemical agent is a hypernym of scavenger; that is, chemical agent is a word with a broader meaning than scavenger:

scavenger: a chemical agent that is added to a chemical mixture to counteract the effects of impurities
chemical agent: an agent that produces chemical reactions

scavenger (noun)	chemical agent (noun)
any animal that feeds on refuse and other decaying organic matter	an agent that produces chemical reactions
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