I am finding there to be many names applied to fermented Honey products. Strictly speaking they are all Meads. Somewhere along in their history, some of them have been given names more specific to the adjunct used in the ferment. Please be aware that this is a work in progress, and may not include country or region specific Meads. Here goes:
Acerglyn - mead made with Maple Syrup
Bilbemel - mead made with Blueberries
Black Mead - mead made with Black Currants
Bochet — A mead where the honey is caramelized or burned separately before adding the water. Gives toffee, chocolate, marshmallow flavors.
Braggot - mead with barley malt and/or hops added
Cyser - mead made with Apples or Apple Juice
Capsicumel - mead made with hot peppers
Hydromel - mead with a lower alcohol content
Melomels - mead made with fruit. Generally with the name of the fruit before Melomel
Metheglin - mead made with herbs and/or spices
Morat - mead made with Mulberries
Omphacomel - mead made with juice from unripe grapes (verjuice)
Perry - mead made with Pears
Pyment - mead made with Grapes
Rhodomel - mead made with Rose Hips
Rudamel - mead made with Raspberries
Sack mead — mead that is made with more copious amounts of honey than usual. The finished product retains an extremely high specific gravity and elevated levels of sweetness.