The quality or state of being creaky; the characteristic of making creaking sounds.
From 'creaky' with the noun suffix '-ness,' which creates abstract nouns describing qualities or states.
The '-ness' suffix is one of English's most ancient tools—even Old English used '-ness' to turn adjectives into qualities, showing how this pattern has been productive for over 1,000 years.
Complete word intelligence in one call. Free tier — 50 lookups/day.