It depends on the context. For the purpose of this subthread, TUIs belong with GUIs, as both show you current state, make it interactive, and render a 2D view. In contrast, CLI tools only print out a snapshot of the current state (i.e. the output becomes stale as soon as it hits the TTY), and that snapshot is non-interactive.
In other contexts, you'd group CLIs and TUIs together. For example, both can be used from a terminal emulator, both are easy to use over SSH connection, and (an underappreciated feature) in both CLI and TUI apps, it's easy to just copy what they show as text.
edit I see others beat me to it in mentioning mc. I'll leave this here anyway.