For loop on text without effecting each other

I’m trying to create a certain number of text areas based on the length of a word using a for loop. It works, however when i edit one text area, all of them get edited. Does anyone know how I can make it so it doesnt effect all the text areas made in the for loop?

static var underScore : String = "_";

var guessTextStyle : GUIStyle;

var word : String;

function OnGUI() {

	textPosY = Screen.height - 50;
	textPosX = 25;
	i = 0;
	
	for(i = 0; i <= word.length; i++)
	{
		underScore = GUI.TextArea(Rect(textPosX,textPosY,50,50),underScore, 1, guessTextStyle);
		textPosX += 75;
	}

}

You need each text to have its own input string.
You kept changing the same one.

static var underScore : String[];// = "_";

var guessTextStyle : GUIStyle;

var word : String;
private var lastWord : String;

function Start()
{
    UpdateUnderScoreWhenNewWord();
}
function Update()
{
    // I urge you to call UpdateUnderScoreWhenNewWord() only when you need - string          
    // comparison is costly
    if ( word != lastWord )
      UpdateUnderScoreWhenNewWord();
}

// Currently - this clears word!!!!!
function UpdateUnderScoreWhenNewWord()
{
   lastWord = word;
   underScore = new String[word.Length];
   for(var i=0; i<underScore.Length; i++)
   {
      underScore *= "_";*

}
}

function OnGUI() {

textPosY = Screen.height - 50;
textPosX = 25;
i = 0;

for(i = 0; i <= word.length; i++)
{
underScore = GUI.TextArea(Rect(textPosX,textPosY,50,50),underScore*, 1, guessTextStyle);*
textPosX += 75;
}

}