Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
speculative
←
Old French
speculatif
(derived)
←
Latin
speculor
(derived)
→
English
speculatively
(suffix)
→
English
nonspeculative
(prefix)
→
English
speculativeness
(suffix)
→
English
speculativity
(suffix)
→
English
antispeculative
(prefix)
→
English
unspeculative
(prefix)
→
English
overspeculative
(prefix)
→
Danish
spekulativ
(link)