General strangeness:
* Oddity: This is a common and neutral term for something unusual or peculiar.
* Curiosity: This emphasizes the intriguing or mysterious aspect of something strange.
* Abnormality: This suggests something that deviates from the norm or expected standard.
* Anomaly: Similar to "abnormality," but often implies something that is difficult to explain.
More specific types of strangeness:
* Weirdness: This emphasizes the bizarre or unsettling nature of something strange.
* Bizarreness: This suggests something that is shockingly unusual or outlandish.
* Eerie: This implies a sense of haunting or unsettling strangeness.
* Grotesqueness: This refers to something that is distorted or repulsive in its strangeness.
If you can provide more context, I can help you choose the best noun for your specific needs.