acetum vs ethanoic acid

acetum and ethanoic acid both are nouns.

Word	Noun	Adjective	Verb	Adverb
acetum	Yes	No	No	No
ethanoic acid	Yes	No	No	No

As nouns, ethanoic acid is a hypernym of acetum; that is, ethanoic acid is a word with a broader meaning than acetum:

acetum: a dilute solution of acetic acid that is used as a solvent (e.g. for a drug)
ethanoic acid: a colorless pungent liquid widely used in manufacturing plastics and pharmaceuticals

Other hypernyms of acetum include acetic acid.

acetum (noun)	ethanoic acid (noun)
sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative	a colorless pungent liquid widely used in manufacturing plastics and pharmaceuticals
a dilute solution of acetic acid that is used as a solvent (e.g. for a drug)