What's the noun for somethingness? Here's the word you're looking for.
something
An object whose nature is yet to be defined.
An object whose name is forgotten by, unknown or unimportant to the user, e.g., from words of a song. Also used to refer to an object earlier indefinitely referred to as 'something' (pronoun sense).
“So does every other Right Thinking Citizen, and by crikey, they're making sure that those somethings are heard.”
“The crowd was quite young, mostly twenty somethings in unintentionally comic woolly hats.”
“Cameron looked up towards the main room, filled elbow-to-elbow with drunk, sweaty teens and twenty somethings, chatting and laughing and grinding and touching.”
“These people are political no-bodies who fancy themselves to be somebodies.”
“Now, it seems, in order to cease being politically led nonentities, councillors aspire to become politically led somebodies by virtue of paying themselves more and more.”
“The National Popular Vote plan would make them somebodies — and that, perhaps more than the high-minded stuff, is why N. P. V. has a pretty good chance of actually happening.”