Are there call of duty 4 cheats that can be used in multiplayer online against real people if so what are they?

Call of Duty 4 doesn't support any cheat codes for online play.

Actually they do, you have to be on a server that you have created. So here is how you do it go to the main menu of the game and hit the Console button (~) and type in /devmap mp_(the map you want), so here is what it will look like /devmap mp_killhouse. Then hit enter. some cheats are

/noclip

/g_gravity 40

/r_fullbright 1

/Jump_hight 1000

/god

/player_sprintspeedscale 0-5

/cg_thirdperson 1

/UFO ( same as noclip)

/give all

/take all

/turn_me_into_a_bunny (lol that's not one JK)

And BTW you have to type this all into the console (~) hope that helps