This is the 4872nd most frequent Spanish word.
desayuno
Breakfast.
In this sentence, 'desayuno' is used as a noun referring to the meal eaten in the morning.
Yo como cereal en el desayuno.
I eat cereal for breakfast.
Here, 'desayuno' is used as the first-person singular present indicative verb indicating the act of eating breakfast.
Desayuno temprano antes de ir al trabajo.
I have breakfast early before going to work.
This instance employs 'desayuno' as a noun again, discussing the composition of the morning meal.