mast, massed

Mast or mast means the spar that holds sails on a boat or ship, or an upright post in general--
The ship was in port, waiting to have its mast repaired.
There wasn't a tree left that was large enough to make a ship's mast.

Mast or captain's mast may also mean a hearing on board a ship, for a crew member accused of a minor offense--
He has to appear at a captains' mast in the morning.

Mast may also mean acorns or wild nuts used as food for livestock--
We can feed the hogs mast if we run out of grain.

Massed or massed ( rhymes with mast ) is the past tense ( yesterday, or some time ago ) of "mass", meaning to gather together in bulk; to form one large body--
She beat the mixture until it massed into one lump of dough.
A crowd massed below the window, wondering if the mayor would speak to them.

Now that you know that, you can say--
"The wind blew until the sails massed in one lump around the broken mast."

Note--"amassed" is the past tense of "amass", meaning to gather together or assemble; to collect or accumulate--
He amassed a large fortune trading stocks and bonds.
Not to be confused with "a mast", meaning one ( a ) spar that holds sails on a ship ( mast )--
We'll need a piece of wood large enough to make a mast.