"Print lines by number" is a vague thing to say, particularly since the comparison later includes, "Print specific lines by number".

However, the grep -Hn feature is described in this comparison as, "Prefix the line number to matching lines"

One thing that can help people to compare this sort of tool is to pair technical descriptions like command line parameters with the natural language explanation. If tool foo has a feature you're describing as "Prevent cheesecake" then I have no idea if my tool bar can do that, whereas if you say this is -Xqm then I can read the documentation and discover that I call this "disable refrigerated dessert" and it's -VQb so yes, my tool does this too.

I spent some time recently reading the proposals to fix/ extend C++ ranges P2214 - and because this general idea is very common they often discuss Haskell, Rust or even Python. If you're experienced in a language you already know whether it would spell something FlatMap, flat_map, or flatMap but you might not guess that C++ people would call your filter_map by the name transform_maybe, or as a C++ programmer who has barely dipped their toe in Haskell you wouldn't know that Haskell doesn't use the word "transform" in this context and without being told what it's called you won't find the relevant documentation let alone be able to try it for yourself and appreciate what it's for.