It’s based on how it forms. Ice is usually a chunk/body of water all freezing together at once. Snow has a starting point of ice that grows bigger as moisture comes into contact with and freezes. If this happens slow enough then moisture contact will be more likely at points sticking out so you get air gaps in between the points of contact where freezing/growth is occurring.
Once the water is frozen it won’t bond/crystalize with a neighboring snowflake unless some melting occurs.
So snow is ice, but it’s a grown ice crystal with more air gaps than a frozen droplet of rain.
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