The term that seems to be gaining acceptance for what the OP is doing is "self-connecting".

Dublin Airport: Self-connecting passengers are not permitted to use the Flight Connections facility

RoutesOnline: Dublin airport tops European league for self-connecting passengers

Channel News Asia: Changi Airport comes up tops in Asia for self-connected flights: report

CAPA: Redefining airport hubs: (Self)-connectivity: the next vital piece in the industry’s advancement

Some airports, including Gatwick and Milan-Malpensa, are introducing services where some self-connecting passengers can avail of protections that would otherwise not be available to them:

Gatwick unveils flight connection guarantee to eliminate financial risk of 'self-connecting'

Milan Malpensa also offers a similar "guarantee" service to self-connecting passengers, who book using their "Via Milano" service.

OP: Arguments about semantics are just background noise here; it you miss the second flight, you have no recourse to Ryanair (even if a delay which is fully their fault is the reason you miss your second Ryanair flight) and will likely have to pay a walk-up fare for whatever is the next flight to your destination or a workable alternative destination.