pilluelo
rascal
pillo
rogue
+
-uelo
diminutive suffix
Pilluelo means rascal and can be thought of as a small rogue0 (pillo0) with the diminutive suffix1 (-uelo1).
noun
- rascalA mischievous or naughty child, especially a young boy.El pilluelo se escondió después de romper la ventana. // The rascal hid after breaking the window.