English has a few suffixes that can make abstract nouns out of adjectives. There's the relatively rare –cy, which turns fluent into fluency and idiot into idiocy, and there's the more common –ty or ...

Think about concrete for a second -- even if you weren’t already thinking about it. Can you picture it? Can you feel its hardness? Do you see a driveway, sidewalk, or building in your mind? Concrete ...