This is the 8484th most frequent Polish word.
portugalczycy
"Portugalczycy" means "Portuguese people" in English.
The word 'Portugalczycy' serves as the subject of the sentence, referring to the people of Portugal.
Portugalczycy są znani ze swojej pysznej kuchni.
The Portuguese are known for their delicious cuisine.
Here, 'Portugalczyków' is the plural, instrumental case form of 'Portugalczycy', showing the involvement of certain Portuguese people in the action.
Byliśmy na wakacjach w Portugalii, gdzie poznaliśmy kilku Portugalczyków.
We were on holiday in Portugal, where we met some Portuguese people.
In this sentence, 'Portugalczyk' is the singular, nominative form and refers to one male individual from Portugal.