diol vs glycol

diol and glycol both are nouns.

Word	Noun	Adjective	Verb	Adverb
diol	Yes	No	No	No
glycol	Yes	No	No	No

As nouns, diol and glycol are synonyms defined as:

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

Other synonyms of diol include dihydric alcohol.

diol (noun)	glycol (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
	a sweet but poisonous syrupy liquid used as an antifreeze and solvent