Chatted Event Help/Multiple Functions[EDIT]

The script has been edited, still doesn't work. Please help me out!

admins = {"wattleman"}
group = {899203}
rankid = 50
keyword = {"gun"}

function isAdmin()
	for i,v in pairs(admins) do
		if Player.Name == (v) then
			return true
			elseif Player.Name ~= (v) then
			for i,v in pairs(group) do
				if Player:isInGroup(v) and Player:GetRankInGroup(v) >= 50 then
					return true
				end
			end
		end
	end
end


game.Players.PlayerAdded:connect(function(Player)
	Player.Chatted:connect(function(Message)
		if Player(isAdmin(Player)) then
			for i,v in pairs(keyword) do
				if Message:lower() == (string.sub("gun") (1, 3)) then
					trigger()
					elseif Message:lower() == (string.sub("countdown") (1, 9)) then
					local cdt = game.Lighting.CountDownTimer
					local timer = game.Lighting.Timer
					cdt.Value = "Active"
					for i = 3, 0, -1 do
						timer.Value = i
						wait(3)
						timer.Value = "GO!"
						wait(1)
						cdt.Value = "NotActive"
					end	
				end
			end
		end
	end)
end)

function trigger()
	script.Parent.Parent.Part1.Transparency = 0
	script.Parent.Parent.Part1.CanCollide = true
	wait(.1)
	script.Parent.Parent.Part2.Transparency = 0
	script.Parent.Parent.Part2.CanCollide = true
	wait(.1)
	script.Parent.Parent.Part3.Transparency = 0
	script.Parent.Parent.Part3.CanCollide = true
	wait(.1)
	script.Parent.Parent.Part4.Transparency = 0
	script.Parent.Parent.Part4.CanCollide = true
	wait(.1)
	script.Parent.Parent.Part5.Transparency = 0
	script.Parent.Parent.Part5.CanCollide = true
	wait(.1)
	script.Parent.Parent.Part6.Transparency = 0
	script.Parent.Parent.Part6.CanCollide = true
	script.Parent.Parent.Parent.SFing.Part1.Transparency = 1
	script.Parent.Parent.Parent.SFing.Part1.CanCollide = false
end

No, this script will not work.

The PlayerIsInGroup method takes a number, not a string, which you are putting in the "Groups" table.

On line 15 you are checking if the player is in the group with the id 50, then checking if their rank in group 50 is higher than or equal to 50. But, the fact is you tried to check for a different group previously.

On line 26 you define the Player as P1 but then try to use Player as the player, and P1 as a function. That would fail to work. Take out the part where you use P1 as a function and just keep the IsAdmin part. Also rename P1 to Player and you should be good to go on this part.

After edit: You're still trying to use the player as a function. Replace Player(isAdmin(Player)) with isAdmin(Player)