Create a glossary using Simple JSON, loading data dynamically

I everyone, I am not a programmer so my knowledge of code is a bit sketchy. I am creating an app with inside a glossary to display. I use a JSON file containing all the informations (glossary entries and their definition) and I want to display it according to the hierarchy of content. This means 3 different levels of information :

• a level with all the letters (a, b, c, ..., z)

• a level with all the words starting with the selected letter (Antivirus, Authentification, ...)

• a level with the definition of the selected word

Here is the JSON file (not finished, just the structure) :

 {
     "data":
     {
         "a":
         [
             {
                 "word"    :    "Adresse IP",
                 "def"    :    "blablabla"
             },
             {
                 "word"    :    "Alphabétisation numérique",
                 "def"    :    "bliblibli"
             }
         ],
 
         "b":
         [
             {
                 "word"    :    "Baladodiffusion",
                 "def"    :    "blobloblo"
             },
             {
                 "word"    :    "Balise",
                 "def"    :    "blublublu"
             }
         ]
     }
 }

I managed to parse my JSON file and display the list of all the words starting with "a" :

 TextMesh myText;
 BoxCollider myTextCollider;
 public Camera camera;

 void Start ()
     {
         
         ListOfWords();
 
     }

 void ListOfWords()
     {
         SimpleJSON.JSONNode node = SimpleJSON.JSONNode.Parse(Resources.Load<TextAsset>
         ("JSON/test").text);
 
 
         int numberOfDefInA = node["data"]["a"].Count;
         //Debug.Log(numberOfDefInA);
 
         // Creating a list of the words starting with "a"
         for(int i = 0; i < numberOfDefInA; i++)
         {
             string currentWord = node["data"]["a"][i]["word"];
             //Debug.Log(currentWord);
 
             // Prefab
             GameObject Word = (GameObject)Instantiate(Resources.Load("word"));
 
             Vector3 myTextPos = transform.position;
             myTextPos.x = -5;
             myTextPos.y = (float)(2 - 0.6 * i);
             Word.transform.position = myTextPos;
 
             myText = Word.GetComponent<TextMesh>();
             myText.text = currentWord;
 
             // adding a collider to each word, scaling it to the mesh renderer
             myTextCollider = Word.AddComponent<BoxCollider>();
             myTextCollider.center = new Vector3 (Word.renderer.bounds.extents.x, Word.renderer.bounds.extents.y - Word.renderer.bounds.size.y / 2, myTextPos.z);
             myTextCollider.size = new Vector3 (Word.renderer.bounds.size.x, Word.renderer.bounds.size.y, 1);
 
         }
     }

It creates a GameObject for each word, position it below the previous one and add a collider that fits the mesh renderer (A big thanks to MikeNewall for that bit of code !). Now my problem is : I don't know how to transform these words into buttons, meaning when you click on a word or touch it (for IOS) it displays its definition.

I started to detect a mouse click using Raycast inside the Update :

 void Update ()
     {
         if (Input.GetMouseButtonDown(0)){ // if left button pressed...
             Ray ray = camera.ScreenPointToRay(Input.mousePosition);
             RaycastHit hit;
             if (Physics.Raycast(ray, out hit)){
               // the object identified by hit.transform was clicked
               // do whatever you want
               Debug.Log(ray);
             }
          }
     }

But I am now stuck, I can't figure how to retrieve the data from the loop for inside the ListOfWords() function and use it with the Update, but maybe this is not how to proceed ? I would be very grateful if someone could help me on this one,

Thank you in advance !