Unfortunately, Blizzard is not always consistent on how they use the terms. Sometimes they use the term '"race" when they mean the biological definition of "species". This has led to conflicts between sources, where one source says blood elves and high elves are the same "biological race" ("biological species" would have been a more proper use of words in that syntax), while most sources say they are separate races (culturally and biologically).
Humans are the dominant (as in “most obvious”) intelligent species on Azeroth, but they are by no means alone. Elves, dwarves, tauren, imports such as orcs, and so on all share the world with humanity. In some cases, such races have proven far more influential than humanity over the long term.WRPG 38
For example, "since the beginning of the First War, orcs have interbred with a number of species" that vary largely in appearance; mostly with humans, "but half-ogres and half-draenei are not unheard of".HPG 139
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This is a list of sapient "species" established in lore. Additionally, each grouping within the same group, such as various types of dwarves, elves, or trolls, are considered separate species/race or subspecies/subrace depending on the source.