There are multiple synonyms for the phrase "piled in," including crowded, jammed, stuffed, crammed, packed, and filled to capacity. All of these phrases indicate a large number of people or objects occupying a limited space, often to the point of discomfort. "Crowded" refers to a space that is full of people; "jammed" suggests that the space is so full that it is difficult to move; "stuffed" implies that the space is full to the point of bursting; "crammed" suggests that the space is full to capacity; "packed" refers to a space that is filled with people or objects; and "filled to capacity" indicates a space that is unable to accommodate any more people or objects.