expansibility.com
Real, precise, polysyllabic nouns still available on the .com are rare, and the remaining ones are usually awkward or obscure. This is neither: uncommon but transparent, understood immediately by anyone reading it.
Expansibility is the property of being able to expand, a genuine term in physics and materials science describing how substances behave under heat and pressure, with an obvious metaphorical use in business.
That double life gives it range. A materials science company, an engineering consultancy or a technical product on one side. A growth consultancy, a scaling platform or a business advisory on the other. It means capacity for growth in both registers.
Thirteen letters, five syllables, one spelling, no hyphen, and a clean trademark path because almost nobody has used it commercially.
Available now. Offers welcome.