pyrogallic acid vs pyrogallol

pyrogallic acid and pyrogallol both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyrogallic acid	Yes	No	No	No
pyrogallol	Yes	No	No	No

As nouns, pyrogallic acid and pyrogallol are synonyms defined as:

pyrogallic acid and pyrogallol: a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer

pyrogallic acid (noun)	pyrogallol (noun)
a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer	a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer