Count occurrences of a specific word in Google Spreadsheet


I have some cells with text. I need to count the occurrences of a specific word from those cells.

Example sheet:https://docs.google.com/spreadsheets/d/1WECDbepLtZNwNfUmjxfKlCbLJgjyUBB72yvWDMzDBB0/edit?usp=sharing