Belongs to Many Pivot table naming

To determine the table name of the relationship's intermediate table, Eloquent will join the two related model names in alphabetical order.

This would mean a join between Post and Tag could be added like this:

1class Post extends Model
2{
3    public $table = 'posts';
4 
5    public function tags()
6    {
7        return $this->belongsToMany(Tag::class);
8    }
9}

However, you are free to override this convention, and you would need to specify the join table in the second argument.

1class Post extends Model
2{
3    public $table = 'posts';
4 
5    public function tags()
6    {
7        return $this->belongsToMany(Tag::class, 'posts_tags');
8    }
9}

If you wish to be explicit about the primary keys you can also supply these as third and fourth arguments.

1class Post extends Model
2{
3    public $table = 'posts';
4 
5    public function tags()
6    {
7        return $this->belongsToMany(Tag::class, 'post_tag', 'post_id', 'tag_id');
8    }
9}

Tip given by @iammikek