I'm surprised to hear you haven't had these "before". These are all long standard Chromium process types.
1- Spare Renderer
Chromium tries to put each web site in its own process, as much as possible, for security. (The actual rules for how sites are assigned to processes are complicated, because there are a lot of tradeoffs to make between security and performance.) The "spare renderer" is a process that's kept around ready to load a site into, for faster startup.
2- Renderer
This is a process that's currently loaded one or more web sites.
3- utility: storage service
This process manages access to web features that store data on disk (eg. Local Storage, IndexedDB). At least, that's what I assume from the name. I'm not an expert on this.
Chrome 88 has Flash removed entirely so I assume when you upgrade to that, this will go away completely. I'm surprised this was loaded with Flash disabled in older versions, but maybe it's normal to keep the broker loaded but just not doing anything.
5- utility: network service
Manages the HTTP stack. When you go to
http://example.com, this process will contact the
example.com server and fetch the bytes from the net, then pass them off to whichever renderer process handles
example.com for parsing.
6- router service
This one I don't know.