These are the weapons of Metroid Prime.  There area some that are from the earlier games.  But some are new like the visors and the beam combos.
Missiles: Once you gain these, you can launch missiles.  There are plenty of these.
Energy Tank: Adds 100 more units to your health.  There are a lot of these.
Power Beam: Your regular beam.  You always have it.  It's the weakest gun.
Wave Beam: When you get this you can shoot wave like shots.  And it can home onto enemies.
Ice Beam: This gun will let you freeze enemies when you shoot them.
Plasma Beam: This gun is a fire gun and is the second strongest gun.
Phazon Beam: The strongest gun in the game.  You step in  Phazon, charge it, and...boom!
Charge Beam: Allows you to charge your weapon to make it even stronger.
Morph Ball: This upgrade allows you to morph into a ball basicly.
Bombs: When in Morph ball mode, you can set bombs.
Boost Ball: Allows you to go fast when in a ball by charging your self up...in a ball.
Spider Ball: This allows you to cling on to magnetic rails when in morph ball.
Power Bomb: Allows you to set powerful bombs in a ball.
Space Jump Boots: Allows you to jump a second time in the air. 
Grappling Beam: Allows you to grapple onto things.
Power Suit: The Power Suit is the weakest suit and has no extra abilites.
Varia Suit: Allows you to venture into high tempertured areas.
Gravity Suit: Allows you to move normally through water.
Phazon Suit: Allows you to touch blue phazon.
Combat Visor: It's the regular visor that you use to attack enemies.
Scan Visor: It allows you to scan things and activate things and get information.  It's important ok.
Thermal Visor: Allows you to see things that are heated.  Good for finding invisible enemies.
X-Ray Visor: Allows you to see all invisible enemies and invisble walls and enviroments.

Weapon Combos
Super Missiles: With a power beam and 5 missiles, you can shoot  a super strong shot.  This can destroy Cordite.
Wavebuster: With a wave beam and 10 missiles, you can launch out a stream of electricity.
Ice Spreader: With a ice beam and 10 missiles, you freeze a whole area!
Flamethrower: With a plasma beam and 10 missiles, you can use your plasma beam as a flamethrower.
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