Brandable domain name based on the word "nuclear". The name could work as an application / software name.
The word "nucleary" contains eight characters and four syllables. Established brands using four syllable names include Panasonic, Coca-Cola and Airbnb.
Nucleary.com is a dot-com domain. Dot com domains are the most valuable domain extension in the world, famously used by websites like youtube.com. A dot-com is the first thing people think of when they think of a website.