The term "nest egg" refers to ones financial savings for retirement.
It means that the egg is not useful any more. If in it was a bird or duck or somthing, it means that it is dead.
"An egg bank contains frozen donor eggs, used for reproduction. A nest egg is typically an accumulation of money used for retirement. Therefore an egg bank is not the same as a nest egg."
A bird's nest typically contains a tiny egg.
"Egg in a nest" typically refers to eggs cooked in a piece of bread with a hole in the center, where the egg is cracked and cooked inside the hole. It's a simple and tasty breakfast dish.
Egg and nest have a short e sound in both words.
Farmers used to leave one egg in the hen's nest to encourage her to have more eggs.
egg
the nest
N.E.
A cuckoo does not make a nest, a cuckoo will lay an egg in another birds nest, the other bird will then care for the egg and chick as if it was it's own.
Some reptiles lay egg in the nest and some reptiles lay egg on the land.