Surprising words not accepted

[Nylimb]

COLATION, defined as "The act or process of straining or filtering", is accepted, but COLATIONS is not.

[Nylimb]

FAKENESS, "the condition of being fake", is not accepted.

[Nylimb]

TYPER is not accepted. It means someone who types; unlike TYPIST it doesn't imply that the person types professionally.

[BoggleOtaku]

That made me think of Fluter, Violiner, Soloer; there's a whole slew of similar cases without a suitable word to separate amateur from professional. On the flip side, how about workist for a professional worker, or sun tannist, or runnist?

Maybe, at least in some of these cases, there is lack of motivation at least on one side to make such a distinction, and thus the lack of a word.