ammoniacal vs ammoniac

ammoniacal is not a noun while ammoniac is a noun.

Word	Noun	Adjective	Verb	Adverb
ammoniacal	No	Yes	No	No
ammoniac	Yes	Yes	No	No

As adjectives, ammoniacal and ammoniac are synonyms defined as:

ammoniacal and ammoniac: pertaining to or containing or similar to ammonia

ammoniacal (noun)	ammoniac (noun)
	the aromatic gum of the ammoniac plant

ammoniacal (adjective)	ammoniac (adjective)
pertaining to or containing or similar to ammonia	pertaining to or containing or similar to ammonia