Get user input from EditText, query that word from SQLite database and populate result

I am learning programming and trying developing very basic Dictionary Application using Android Studio.

Database and table created, when application runs and able to populate data using following query. Cursor res = db.rawQuery("select * from " + TABLE_NAME + " WHERE WORD = 'home' ", null);

The problems is that, in MainActivity class, I have created a method

public EditText getEditText(){
    EditText getText = (EditText)findViewById(R.id.editText_SearchWords);
    return getText;
}

and in DatabaseHelper Class.

public Cursor getWord() {
    MainActivity obj = new MainActivity();
    EditText searchWord = obj.getEditText();
    String word = searchWord.getText().toString();

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor res = db.rawQuery("select * from " + TABLE_NAME + " WHERE WORD ="+word, null);
    return res;
}

However, after implementing above query and method, App crashes and does not do anything. It have been playing up for a week and couldn't figure out the problems. Any help would be great support in my learning.