How to spell NONINTERCHANEGABLE correctly?

The correct spelling for "noninterchanegable" is "non-interchangeable". It is important to add a hyphen between "non" and "interchangeable" to make it clear that these two words are not interchangeable or interchangeable with each other.

• noninterchangeable The parts are noninterchangeable because they are different sizes and shapes.

Attenttion

• attention
• attentions
• attenuation
• inattention