This page shows a list of consecutive quadruplets drawn in Powerball, ordered by frequency.
There is no difference between Goblins and Orcs as far as being different species. They are basically the same. If I had to name one difference it would be that Goblins are a type of Orc that has developed more to tunnels and caves, whereas Orcs I think of more patrolling in open spaces, such as the plains of Gorgoroth.
The Elves would have classed the creatures called 'trolls' (in The Hobbit and The Lord of the Rings) as Orcs-in character and origin-but they were larger and slower. It would seem evident that they were corruptions of primitive human types. [This updates question V.G.2 of the Tolkien LessFAQ .]. It is not at all clear.