animal charcoal vs bone char

animal charcoal and bone char both are nouns.

Word	Noun	Adjective	Verb	Adverb
animal charcoal	Yes	No	No	No
bone char	Yes	No	No	No

As nouns, animal charcoal and bone char are synonyms defined as:

animal charcoal and bone char: black substance containing char in the form of carbonized bone; used as a black pigment

Other synonyms of animal charcoal include animal black, bone black.

animal charcoal (noun)	bone char (noun)
black substance containing char in the form of carbonized bone; used as a black pigment	black substance containing char in the form of carbonized bone; used as a black pigment