Learning new words, there is the definition of verb: to fertilize
To supply nourishment to plants.
I thought nourishment was some kind of fertilizer, then looking at the dictionary and also the translation I realize that is a way to say food.
If I speak nourishment to a native speaker he will understand what I saying (any person)? Sounds like a difficult, old-fashioned word that only some people know.
Is there a difference about meaning between these words that I missing? Are they interchangeable?
In ngrams the word nourishment is not usual than food, is still used?