Arithmos, number; arithmetic.
Aster or astron, a star; astronomy, astrology, asteroid, disaster.
Atmos, vapour; atmosphere.
Autos, self; autocrat, autograph.
Ballo, I throw; symbol.
Bapto, I dip; baptise, baptist.
Baros, weight; barometer.
Biblos, a book; Bible, bibliomania.
Bios, life; biography, biology.
Cheir, the hand; surgeon [older form, chirurgeon].