What Is Their Main Difference?
'Lightening' is the present participle form of the verb 'lighten', whereas, 'lightning' refers to the spark of electricity we use in the sky when we have thunderstorms. Look at the examples below:
I sat in the balcony and watched as the
They are only similar in that they have nearly the same dictations.
Are They Interchangeable?
Although they look somehow the same, they cannot be used interchangeably, because they have different meanings. Compare:
✓ It is dangerous to stay out when they is
X It is dangerous to stay out when they is