1. The contents of water-closets, appropriated to manure land.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• bight soil,
• might soil,
• jight soil,
• hight soil,
• nught soil,
• njght soil,
• nkght soil,
• noght soil,
• n9ght soil,
• n8ght soil,
• nifht soil,
• nivht soil,
• nibht soil,
• nihht soil,
• niyht soil,
• nitht soil,
• niggt soil,
• nigbt soil,
• nignt soil,
• nigjt soil

The adjective form of the word "night soil" is "nightsoil".

The plural form of "night soil" is "night soils"

The singular form of the word "night soil" is "night soil". It is also used as a mass noun and does not have a distinct singular form.