I know absolutely nothing about Arabic, and stumbled across this page about Broken Plurals on wiki:

https://en.wikipedia.org/wiki/Broken_plural

Look a few rows into the patterns table, and you start seeing fun rearrangements for patterns such as CaCaC -> ʼaCCāC, the example being sabab -> ʼasbāb.

Pretty fascinating stuff!

It is one of the common plural forms. (In Arabic writing the words look even more similar, since it is only the three consonants, with diacritical marks above and below to represent the vowels.)