ethylene glycol vs antifreeze

ethylene glycol and antifreeze both are nouns.

Word	Noun	Adjective	Verb	Adverb
ethylene glycol	Yes	No	No	No
antifreeze	Yes	No	No	No

As nouns, antifreeze is a hypernym of ethylene glycol; that is, antifreeze is a word with a broader meaning than ethylene glycol:

ethylene glycol: a sweet but poisonous syrupy liquid used as an antifreeze and solvent
antifreeze: a liquid added to the water in a cooling system to lower its freezing point

ethylene glycol (noun)	antifreeze (noun)
a sweet but poisonous syrupy liquid used as an antifreeze and solvent	a liquid added to the water in a cooling system to lower its freezing point