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human
[Middle Earth] What exactly ARE Uruk-Hai?

At first I thought they were half-orc, half-goblin, but I noticed that Tolkien seems to use the word interchangeably, and apparently considers them the same thing. So what are Uruk-Hai supposed to be? Well-fed orcs?
gpt
"Uruk-hai" translated literally means "Orc-folk." "Uruk," from the black speech related to "orc" and the Quenya word "urko" of the same meaning. The "-hai" meaning "folk."

They are a sub-species of orcs, Gandalf mentioned Saruman breeding the Uruks to possess the traits of "orcs and goblin men" without the two races' weaknesses. So not necessarily half-goblin, but possessing the traits of goblins.