bread, bred

Bread or bread means the loaf we slice to make toast or sandwiches--
Would you get a loaf of bread from the store?
Do you want wheat bread or white bread?
We don't have any bread.
Bread is also hippie slang for money--
We don't have any bread, man.

Bred or bred ( rhymes with bread ) is the past ( yesterday, or some time ago ) tense of "breed",  meaning to grow and care for ( animals or plants) or to reproduce ( germs )--
These puppies were bred in our home.
He has bred a new strain of lima beans.

Now that you know that, you can say--
"These germs were bred on  moldy bread."

Note--"bred" is sometimes used to mean the raising or educating of people, as in the expression "well-bred"--
He is a well-bred young man.
Most other uses of "bred" to mean people sound pompous.