massive

“a massive effort” 

Theearthquake caused massive damage to the city. 

mass

a mass of snow and rocksfalling down the mountain

enormous 

The elephant was enormous

The project required an enormous amount of money

gigantic

/dʒaɪˈɡæntɪk/

The Titanic was agigantic ship. People used to believe it was unsinkable.

The gigantic whale shark was more than 40 feet long.

giant

The giant basketball player is over seven feet tall.