drier vs chemical agent

drier and chemical agent both are nouns.

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

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

drier: a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)
chemical agent: an agent that produces chemical reactions

drier (noun)	chemical agent (noun)
an appliance that removes moisture	an agent that produces chemical reactions
a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)