Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Serbo-Croatian -ost
Old Church Slavonic -ость (cognate)
Proto-Slavic *-ostь (inherited)

Serbo-Croatian žilavost (affix)
Serbo-Croatian reaktivnost (affix)
Serbo-Croatian smrtnost (affix)
Serbo-Croatian gorljivost (affix)
Serbo-Croatian pretilost (affix)
Serbo-Croatian javnost (affix)
Serbo-Croatian ljubaznost (affix)
Serbo-Croatian jalovost (affix)
Serbo-Croatian jasnost (affix)
Serbo-Croatian umišljenost (suffix)