This is the 2912th most frequent Polish word.
morza
"Morza" in English means "seas."
In this sentence, 'morza' is in the nominative plural form, acting as the subject of the sentence.
Morza były spokojne rano.
The seas were calm in the morning.
Here, 'morza' is used in the genitive plural form, referring to seas in general.
Widok na morza zawsze mnie uspokaja.
The view of the seas always calms me.
Here, 'morza' is used in the accusative plural form, denoting the objects of the visit.