1. Differences in British and American spelling
Φωτεινή Ψυχάκη
Μαρία Παπαβασίλη
Σταματίνα Ταμπάκου
Εύη Χρυσοχέρη

2. -re/er British : American : Centre Center Fibre Fiber Litre Liter
Words that end in –re in Britain often have those two letters reversed when spelled in American English. Here are some examples:
British : American :
Centre Center
Fibre Fiber
Litre Liter
Theatre Theater

3. -nce/nse Defence Defense Licence License Offence Offense
While the British use the –nce ending, Americans generally prefer –nse.
British : American :
Defence Defense
Licence License
Offence Offense
Pretence Pretense

5. Double vowels “ae” and “oe”
While the British retain the more complex spelling of words with Greek or Latin roots, using the orthodox spelling that was established when those words were brought into the English language as far back as the 14th and 15th centuries, the Americans, as usual, like their terminology simplified.
British : American :
Leukaemia Lukemia
Manoeuvre Maneuver
Oestrogen Estrogen
Paediatric Peditric