pyrogallol vs pyrogallic acid

pyrogallol and pyrogallic acid both are nouns.

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

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

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

pyrogallol (noun)	pyrogallic acid (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