For a noun:
* Simplicity: This refers to the state or quality of being simple.
* Example: "The beauty of the design lies in its simplicity."
For an adjective:
* Simple: This describes something that is straightforward, basic, or uncomplicated.
* Example: "The instructions were very simple."
For an adverb:
* Simply: This means "in a simple way."
* Example: "I simply want to be happy."
Other related words:
* Basic: This means "fundamental" or "essential."
* Elementary: This means "very basic" or "easy to understand."
* Unadorned: This means "without decoration or embellishment."
* Plain: This means "ordinary" or "without any special features."
The best word to use depends on the specific context and the meaning you wish to express.