drying agent vs siccative

drying agent and siccative both are nouns.

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

As nouns, drying agent and siccative are synonyms defined as:

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

Other synonyms of drying agent include desiccant, drier.

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