This is the 1853rd most frequent Polish word.
hiszpan
"Hiszpan" means "Spaniard" or "a Spanish man" in English.
In this sentence, 'Hiszpan' is used as a noun to refer to a person of Spanish nationality or descent.
Hiszpan mieszka w tym domu.
The Spaniard lives in this house.
Here, 'hiszpańsku' is the adjective form derived from 'Hiszpan', used to describe the Spanish language.
On mówi po hiszpańsku.
He speaks Spanish.
In this instance, 'hiszpańskie' is the adjectival form used to describe movies originating from Spain.