Questions about example sentences with, and the definition and usage of "Everytime"

A: The phrases “every time” and “each time” are used interchangeably in conversational American English, though their meanings slightly differ.

In the technical sense, “every” tends to refer to a group of people/things together, while “each” emphasizes the individuality of people/things in a group. However, this slight difference of definition is very small, and the phrases are nonetheless used in place of one another — example below:

1. “Every time I go to the grocery store, I see Allen.”
2. “Each time I go to the grocery store, I see Allen.”

The phrase “whenever” could also be used to substitute these phrases, but I feel like “whenever” is more general, and doesn’t specify time as much.

A: No difference, but most people write Everytime