A full or "pure" parallel hybrid can operate with either power plant on it's own, and it would be a plugin. It also would not be able to charge the battery with the ICE - because this puts it into the same category as the multi-mode hybrids along with the Prius and the Volt, etc.
A mild hybrid covers designs that only partially use the electric capabilities, and/or only use regen to charge the battery.
Please understand that all hybrids in production are either multi-mode (i.e. they can use parallel or serial mode and/or both modes at once even) - or they are mild hybrids.
The mildest hybrid I know of is the Chevy Malibu model that uses a regenerative alternator to charge the 12v battery. So it uses regen to reclaim a small amount of energy that would otherwise have to be sapped from the ICE.
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