This is the 269th most frequent Greek word.
κώστας
"Κώστας" is a Greek male given name, a diminutive of "Κωνσταντίνος" (Constantine).
'Κώστας' here is used as a proper noun, a person's name.
Ο Κώστας είναι φίλος μου.
Kostas is my friend.
'Κώστας' here refers to an unspecified individual with this name, used as a common nomenclature context.
Γνωρίζω έναν Κώστα από τη δουλειά.
I know a Kostas from work.
'Κώστας' is here used metaphorically, referring to a suggested solution named 'Kostas,' possibly for illustrative or shorthand purposes.