Seizure \ ˈsē-zhər \
Seizure is a difficult word for many non-native speakers to pronounce. It can come out sounding like scissors \ ˈsi-zərz \.
If you find a word difficult to pronounce in English, your natural response is to avoid using it or to become anxious when you are about to say it. This can cause you to say the problematic word very fast or slow as compensation.
A better idea is to find an alternative word you can pronounce easily and confidently.
‘Convulsion’ is one alternative as well as ‘spasm’ and possibly ‘fit’, although the other options are more medically accurate.