The word "paside" contains only six letters and only two syllables. Two-syllable names are highly rare and highly desirable. Two syllable names are used by established brands like Walmart, Honda and Hilton.
This domain was first registered in November 2016. Older domains have an advantage when ranking in search engines.
Paside.com is a .com domain. Dot com domains are the most sought after top-level-domain in the world, famously used by websites like youtube.com. When you own a .com, it is much easier to rank for your own name in search engines.