dihydric alcohol vs diol

dihydric alcohol and diol both are nouns.

Word	Noun	Adjective	Verb	Adverb
dihydric alcohol	Yes	No	No	No
diol	Yes	No	No	No

As nouns, dihydric alcohol and diol are synonyms defined as:

dihydric alcohol and diol: any of a class of alcohols having 2 hydroxyl groups in each molecule

Other synonyms of dihydric alcohol include glycol.

dihydric alcohol (noun)	diol (noun)
any of a class of alcohols having 2 hydroxyl groups in each molecule	any of a class of alcohols having 2 hydroxyl groups in each molecule