一个英语谜语 越快解决越好@

语焉不详的，这个谜语似乎不完整。
My first is in “snow” but not in “ice”,
My second is in both “rose” and ”rice”,
My third is not in “pencil” but in “paper”,
My whole is a place where there is a lot of water.
Key: Sea.

what am i?(sea)
my first letter is in "snow"but not in "ice"
my second letter is in "rose"but not in "rice"
my third letter is in "pencil"but not in "paper"
This is aplace,it is fullof water.

it is sea

snow
os
ncil
有意义的应该是won

sea

son