Display?
I'm pretty sure that the answer is DRIFTS. You can get drifts of blooms.
If you mean literally, then it usually means a planting over an area of one particular type of flower ( more often than not, annuals)Species suitable for this would be pansies, petunias, dianthus, roses, bulbs, marigolds, poppies, cinerarias, impatiens, phlox, salvias, snapdragon, stocks.
The homonyms for "massed" are "mast" and "mazed."
Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.Hoplites were soldiers who fought in an early type of massed-lined warfare.
Steel
cold and warm air
Both are used, but "massed choir" removes the confusion with a choir singing a mass.
That would be boron, with an atomic mass of 10.811.
Massed artillery.
They were massed produced
The word that you are looking for is 'Shoah'.
Conventional, massed armies, massed warships. The 1860's Japanese Army was trained by the French, later the Germans. The 1860s navy was trained by Great Britain.
What is the impact of massed produced automobiles?