This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The quality of being peppery.

n. A hot or peppery quality.

n. a hot spiciness

"This dressing works superbly as a counterbalance to the arugula's pepperiness, which is mellowed out by the nuttiness of bean sprouts."

spiciness    spicery    spice