Nomad is an orchestrator but with less batteries included:
https://learn.hashicorp.com/tutorials/nomad/get-started-intr...
https://learn.hashicorp.com/tutorials/nomad/get-started-intr...
Still working through it, but it is seeming like the answer to "What is Nomad" is: Kind of a clustered systemd. By that I'm thinking of systemd as a whole, with it's abilities to run containers, timers, daemons and dependencies...
It answers the swarm/k8s call by having a job runner that can run docker containers.