This is the 113th most frequent Hebrew word.
בנוסף
"In addition."
The word 'בנוסף' (b'nosaf) is used here to introduce an additional activity that complements the main one.
בנוסף ללימודים בבית הספר, היא לומדת גם לנגן על פסנתר.
In addition to studying at school, she also learns to play the piano.
Here, 'בנוסף' is utilized to add extra information about what was included in the dinner.
ארוחת הערב כללה סלט וירקות, ובנוסף הייתה עוגת שוקולד לקינוח.
The dinner included salad and vegetables, and in addition, there was chocolate cake for dessert.
In this case, 'בנוסף' is employed to complement the description of the weather by adding another detail.