drying agent vs chemical agent

drying agent and chemical agent both are nouns.

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

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

drying agent: 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

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