siccative vs desiccant

siccative and desiccant both are nouns.

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

As nouns, siccative and desiccant are synonyms defined as:

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

Other synonyms of siccative include drier, drying agent.

siccative (noun)	desiccant (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)