According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 32 words with the pattern --SI-----E. That is, ten letter words with 3rd letter S and 4th letter I and 10th letter E. In alphabetical order, they are:

assibilate

assignable

assimilate

assistance

desiderate

designable

desipience

desistance

desistence

disimagine

disimprove

disincline

disinclose

disinvolve

gasifiable

hesitative

insipience

insistence

mesitylene

misimprove

musicalise

musicalize

resilience

resistance

resistible

unsinkable

unsizeable

upsideowne

vesiculate

vesiculose

visiophone

visitative