desiccant vs drier

desiccant and drier both are nouns.

Word	Noun	Adjective	Verb	Adverb
desiccant	Yes	No	No	No
drier	Yes	No	No	No

As nouns, desiccant and drier are synonyms defined as:

desiccant and drier: a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)

Other synonyms of desiccant include drying agent, siccative.

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