cider vinegar vs acetum

cider vinegar and acetum both are nouns.

Word	Noun	Adjective	Verb	Adverb
cider vinegar	Yes	No	No	No
acetum	Yes	No	No	No

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

cider vinegar: vinegar made from cider
acetum: sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative

Other hypernyms of cider vinegar include vinegar.

cider vinegar (noun)	acetum (noun)
vinegar made from cider	sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative
	a dilute solution of acetic acid that is used as a solvent (e.g. for a drug)