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At the very start yes, that's a bass riff that Dave wrote.
A "guitar riff" is a short section that a guitar musician has produced.
Try Black Sabbath's NIB (main riff), Iron Man (main riff), Black Sabbath (opening riff) Candlemass' Solitude (main riff, second riff) Deep Purple's Space Truckin' (main riff, chorus riff), Black Night (all) Dio's Holy Diver (opening riff) Danzig's Twist of Cain (opening riff; it's easy but fast)
A guitar "run" is a series of quick single notes played by the guitarist, also sometimes called a lick, or a riff.
It is similar to the opening guitar riff from Ozzy Osbourne's, "Crazy Train".