glycerin

As an adjective glyceric

is (organic chemistry) of or pertaining to glycerol.

As a noun glycerin is

glycerine.

As nouns the difference between taxonomy and glycerin

is that taxonomy is the science or the technique used to make a classification while glycerin is glycerine.

As nouns the difference between glycerin and copygraph

is that glycerin is an alternative spelling of lang=en while copygraph is an early means of producing multiple copies of a document by means of pressing it against a slab of gelatin softened with glycerin and making further copies from the resulting reversed image.