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Trump social media site brought down by Iran hackers
(htxt.co.za)
This is a most excellent place for technology news and articles.
The word "hack" is pre-internet. A "hack" journalist or a "hack job" is basically something unprofessional. It is movies that turned "hackers" into someone that gained access to the "mainframe". In the realm of computer systems, I would argue that a "hack" is doing anything the system was not intended/designed to do. A successful DoS or DDoS needs to find some component of the system that wasn't designed to handle the amount of traffic about to be sent to it.
There are protections for DDoS (iptables, fail2ban, Cloudflare and so on), you have to figure out a way around them, that's a hack.
The current tech-related usage was coined at MIT to mean working on a system. Funny that the oldest recorded source comes from MIT model railroad team.