Can humans have Words? Distinctions? Choir/Band Attunements?
In general, no to the first and last. Distinctions are special kinds of Servitor Attunements, with rank associated with them – so they’re only granted to humans if the human holds that rank! Humans don’t get Words (no one knows how Lilith has hers) and Choir/Band Attunements have other requirements. See the Corporeal Player’s Guide.