excitation vs chiller

excitation and chiller both are nouns.

Word	Noun	Adjective	Verb	Adverb
excitation	Yes	No	No	No
chiller	Yes	No	No	No

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

Other hyponyms of excitation include hair-raiser, thrill.

excitation (noun)	chiller (noun)
something that agitates and arouses	excitation that makes your hair stand up or that chills your bones
the neural or electrical arousal of an organ or muscle or gland
the state of being emotionally aroused and worked up