alcohol vs glycol

alcohol and glycol both are nouns.

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

As nouns, glycol is a hyponym of alcohol; that is, glycol is a word with a more specific, narrower meaning than alcohol:

alcohol: any of a series of volatile hydroxyl compounds that are made from hydrocarbons by distillation
glycol: any of a class of alcohols having 2 hydroxyl groups in each molecule

alcohol (noun)	glycol (noun)
a liquor or brew containing alcohol as the active agent	any of a class of alcohols having 2 hydroxyl groups in each molecule
any of a series of volatile hydroxyl compounds that are made from hydrocarbons by distillation	a sweet but poisonous syrupy liquid used as an antifreeze and solvent