fulminate of mercury vs fulminating mercury

fulminate of mercury and fulminating mercury both are nouns.

Word	Noun	Adjective	Verb	Adverb
fulminate of mercury	Yes	No	No	No
fulminating mercury	Yes	No	No	No

As nouns, fulminate of mercury and fulminating mercury are synonyms defined as:

fulminate of mercury and fulminating mercury: a fulminate that when dry explodes violently if struck or heated; used in detonators and blasting caps and percussion caps

Other synonyms of fulminate of mercury include mercury fulminate.

fulminate of mercury (noun)	fulminating mercury (noun)
a fulminate that when dry explodes violently if struck or heated; used in detonators and blasting caps and percussion caps	a fulminate that when dry explodes violently if struck or heated; used in detonators and blasting caps and percussion caps