glycerol vs glycerin

glycerol and glycerin both are nouns.

Word	Noun	Adjective	Verb	Adverb
glycerol	Yes	No	No	No
glycerin	Yes	No	No	No

As nouns, glycerol and glycerin are synonyms defined as:

glycerol and glycerin: a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils

Other synonyms of glycerol include glycerine.

glycerol (noun)	glycerin (noun)
a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils	a sweet syrupy trihydroxy alcohol obtained by saponification of fats and oils