HUGE adjective extremely large; enormous. "a huge are“ Sentence; This number may not seem huge in comparison to the 12 million people who watch the adverts during coronation street.
massive adjective large and heavy or solid. "a massive rampart of stone“ Sentence; While there are several smaller stones, there are only three of the truly massive stones in that circle left.
enormous adjective very large in size, quantity, or extent. "her enormous blue eyes“ Sentence; Combine the two buildings and you have a potentially enormous event.
gigantic adjective of very great size or extent; huge or enormous. " a gigantic concrete tower“ Sentence; I do worry about the size of the buildings because they seem absolutely gigantic .
monumental adjective great in importance, extent, or size. "it's been a monumental effort“ Sentence; This is a really monumental piece of work by an artist at the peak of his powers.