Add more alternatives to device

proposals/4161-crypto-terminology.md

@@ -402,7 +402,7 @@ over time.
 
 ## Alternatives
 
-### Device vs. Session
+### Device vs. Session and others
 
 There is debate over whether "device" or "session" is the best word to identify
 an instance of a client. In practice, many clients use both words, and there is
@@ -413,6 +413,23 @@ strong opinions in both directions, meaning that some clients would probably
 stick with their wording even if the spec recommended otherwise, so it seemed
 more pragmatic to allow either.
 
+Several other words could also be used:
+
+* "Login" is close in meaning to a device or session, but it could be confused
+  with the actions of logging out or in, rather than an ongoing session.
+
+* "Client" is commonly used in the context of email. This word originates in the
+  technical idea of a client-server protocol, and is rarely used in
+  non-technical contexts. Further, where it is used, it is most commonly
+  referring to a program rather than a logged-in session.
+
+* "App/Application" is very widely used, but is usually referring to a program
+  rather than a logged-in session.
+
+* "Account" is used quite widely, but is normally used to refer to a user's
+  general identity or set of credentials, rather than a specific instance where
+  the user logged in.
+
 ## Further work
 
 Several other concepts might benefit from similar treatment. Within