The second scratching possibly resembles the Hebrew letter Aleph, and the two letters on the end possibly resemble Hebrew lettering Of the two, it is intriguing that the letter it resembles would be the form used on the end of a word (Hebrew reading from right to left). However, spaces weren’t added to the Hebrew language until long after the events ad Masada which makes them suspect. One might also argue that the first letter on the left resembles a malformed Dalet, but none of the other letters resemble Hebrew letters of any time period (at least not without some stretching).
It should also be noted that by the time of the events of Masada, most Jews spoke Aramaic, not Hebrew, though it would not have been unheard of for some to understand it.