how to open closed window in chrome

I have opened two windows in chrome browser,
in each window there are multiple pages .

the first window is the most important for me, the second window is for search tabs.

my problem is that I accidentally closed the first window(window with multiple pages) instead of closing the second window.

how to restore the closed window with all its pages ??? is it possible? is ther any way to do this?

Yes, there is.

1. Click on the 3-bars below the 'X' Close button.
2. Click Recent Tabs (or "History and recent tabs" in newer versions).
3. Click on the first item where it states "N Tabs'; where N is the number of open tabs in the windows that was closed.

It will even work if you close the browser completely.

Added:
You could also open the History tab with CTRL-H and select each tab to open.

Ctrl+Shift+T also works when multiple tabs have been closed.