The difference between the two words is that they are both spelt differently - though neither are spelt correctly - the correct spelling is Autumn.
3 and 5
Automne
There is no difference between a chalkboard and a blackboard; they are two different terms used interchangeably to refer to a smooth, dark surface on which you can write with chalk.
autum wintery in autum or winter about/around there
a tree losing all its leaves in autumm
The correct spelling of the season (fall) is autumn.
The autumnal equinox.
One simile I can think of is fall.
Autum rocks!
something
love is bad
September