Is it possible to be kicked from the game automatically when something is said in chat?

To check what the player chats, we use the Chatted event

game:GetService("Players").PlayerAdded:Connect(function(player)
	player.Chatted:Connect(function(msg)
		-- Code Here
	end)
end)

Next, if you're looking for specific words, you need to break the message up into separate words with string.gmatch ["(%S+)" checks for spaces]

for cease in string.gmatch(string.lower(msg), "(%S+)") do
	-- Code Here
end

To check for phrases, simply iterate over the message with string.match to look for a set of words which matches our censor

if string.match(string.lower(msg), chatted, 1) then
	-- Code Here
end

Finally, if the censor returned a true value (the player said something we dont want them to say) we kick them

player:Kick("Inappropriate Language")

Example Server Script

local censor1 = {""} -- Words
local censor2 = {""} -- Phrases

game:GetService("Players").PlayerAdded:Connect(function(player)
	player.Chatted:Connect(function(msg)
		local check = false
		for index, chatted in pairs(censor1) do
			for cease in string.gmatch(string.lower(msg), "(%S+)") do
				if cease == chatted then
					check = true
				end
			end
		end

		for index, chatted in pairs(censor2) do
			if string.match(string.lower(msg), chatted, 1) then
				check = true
			end
		end
		
		if check == true then
			player:Kick("Inappropriate Language")
		end
	end)
end)

In the above example, all words in the censor arrays should be lowercase (since we check with string.lower()