glycerin vs glycerine

glycerin and glycerine both are nouns.

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

As nouns, glycerin and glycerine are synonyms defined as:

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

Other synonyms of glycerin include glycerol.

glycerin (noun)	glycerine (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