The density is most likely larger because if the density of the nail was smaller than the water it would float .
Science Experiment : EASY
To look at density try putting 3 different liquids in an empty plastic bottle , let it sit , and you'll see the density of the 3 things.
Whatever is on the top has the least density and the bottom has greatest density
test liquids include ...
dish washer soap
milk
water
syrup
sugary drinks
etc.