godsend

noun3

1. •
   An instance of unexpected benefit or good fortune; a windfall.

   • [O]nce again, as in 1803, we were on the brink of being sacrificed to the very lunacies of retrenchment. By a mere god-send, more troops happened to arrive from the Indian continent. — 1843
2. •
   A person who provides greatly needed assistance.
3. •
   (UK, no longer used) The wreck of a ship which has washed up on shore, from which cargo, timber, etc., may be obtained.

   • Its seldom sic [such] rich Godsends come on our coast—no since the Jenny and James came ashore in King Charlie's time. — 1822