Water lily/lotus for ahde?

I've seen posts for this before but can't find them now...I have a pond that
I never realized (until I brought home a solar floating light and really
looked at my sunlight source) is really mostly in shade...explains why my
water lilies never bloomed though I did get some blooms on my water lettuce
(or hyacinth, it may be called).
Does anyone know of some good water lilies or lotus for shade? And
excuse my ignorance, but what is the difference between a water lily and a
lotus?
Thanks--
Kirsten