It looks like a similar system to Hebrew. It's a very similar language; if I know a Hebrew word, I can often recognise the equivalent in Arabic.
Really?
I would probably find it more similar to Nabataean, although I still can't see the equivalents.
My guess is
Robert is referring to the spoken languages more than the written ones. Arabic and Hebrew are closely related linguistically, though they have different
writing systems. Nevertheless, both
writing systems have similarities, such as being written from left to right and also the use of what are called
nikudim (
נִקּוּד = points) in Hebrew (I don't know the term in Arabic): the dots and dashes above or below a letter that imply the values of the
vowels. If I am not mistaken, Arabic always employs these, while Hebrew does not require them to be written.