Doom = slow tempo heavy metal

Sludge = Originally a combination of doom and hardcore punk with violent and misanthropic imagery (Eyehategod) has since evolved into other things. (Atmospheric Sludge / Post Metal / Progressive Sludge)

Traditional Doom = 80’s doom throwback to 70’s heavy metal with general dark imagery (Saint Vitus)

Epic Doom = 80’s/90’s doom with sometimes operatic vocals and romantic / classical subject matter (Candlemass)

Stoner Doom = 90’s throwback to 70’s heavy metal with heavy drug / fantasy imagery (Electric Wizard)

Death/Doom = The combination of death vocals and doom. (Asphyx)

Funeral Doom = Doom slowed to a funerary dirge combined with death like vocals. (Skepticism)

Gothic Doom = A brief combination of death/doom with a melodramatic and gothic atmosphere. (Paradise Lost)
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My brief overview is subject for change if anyone wants to nitpick. I left out black/doom because of a sparse collection of bands actually doing it and drone because I find drone to be more apart of the experimental / avant tree. Traditional