There are 24 words that start with 'sie'.
siege | sieur | sieve |
sieged | sieges | sienna |
sierra | siesta | sieurs |
sieved | sieves | sieging |
siemens | sienite | siennas |
sierran | sierras | siestas |
sievert | sieving | sienites |
sierozem | sieverts | sierozems |
Note: These 24 words that start with 'sie' are found from the USA & Canada version of the tournament Scrabble word list.