The common joke/fact in the nix community is the nix "triad": nix the language, nix the operating system, and nix the package manager. Sometimes it gets confusing, but usually context is enough.
Recently some Linux hobbyists new to the Nix community have started using the word 'Nix' to refer to NixOS, which is wrong and has understandably led to quite some confusion. I wish they'd stop fucking it up.