What's the most common Gears taht Moordryd use in races and how they works?

I wnat to know their names in english

The only ones I can recall off hand are the ones from "The Choosing, Part 2" and "Pride of the Hero". In the first, he asks Cain to "put as much green ramming, black control and light blue stun gear on my dragon Decepshun as she can mag." In the second one, Moordryd uses black shadow gear.

the gear that I see Moordryd use is Red Thruster Gear Black Energy Whip and Black Shadow Gear

What do green ramming, black control, black shadow gear, and Red Thruster Gear ?

Green ramming gear is used to add more strength to a dragon. Black control gear is used to control dragons (I think, or it helps steady draconium energy). Black shadow gear is pretty much either the same thing or another kind of gear. Red thrusting gear is used to speed up, but if it's on reverse can be used to help the dragon brake quicker or be used like a flamethrower.

Green ramming gear is used like a sort of body armor, to protect the dragons face and chest when he dives in to attack and ram someone.

Black control gear does steady draconium energy, and it helps the rider keep more control.

Black Shadow gear causes the rider and dragon to dissapear, like a cloaking device.

Red thrusting gear is used to speed up and brake, like Skylii said.

About four-fifths of the way down this page are most of the gear types:
http://www.dragonboostertcg.com/dspCardList.cfm

There are a few more found here, if you click on the gear section:
http://www.dragonbooster.com/

The best gear matches for a black dragon are black, green, light blue, orange, purple, turquoise, or gray gear.

You can recognize whick ones you've seen Moordryd use from the pictures.

Not mentioned is gray assist gear, which is extremely rare and can be used to enhance a dragon's draconium levels, kind of like steroids or artificial adrenaline for dragons.