How to spell NOTAION correctly?

If you meant "notation", some possible correct suggestions could be "notation", "note-taking", "music notation" or "mathematical notation". Double-check the context to determine which spelling may be most suitable.

• nation
• notation She studied the musical notation with great precision.
• notion The notion that money can buy happiness is often debated.

Attenttion

• attention
• attentions
• attenuation
• inattention