glycol vs diol

glycol and diol both are nouns.

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

As nouns, glycol and diol are synonyms defined as:

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

Other synonyms of glycol include dihydric alcohol.

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