Giant can either be an adjective, describing something of size, or a large character (usually fictional and found in Fairy Tales) of immense size.
'The giant structure towered so far above them, the top seemed immersed within the clouds.'
The giant boomed out again,"Fee-fi-fo-fum, I smell the blood of an English-man!"
The giant was giant.
Ron was fearful if the giant spider with the giant fangs creeping towards him
my dad went to the store and got a giant candy bar
The giant animal ate fodder by the ton.
You write it like this " A giant cabin is so immense"and that how you use immense in a sentence.
the king sat in his throne with a giant cheeseburger.
The giant ship was literally sailing through the littoral zone!
The giant walked with a lumbering gait. (Like frankinstein)
The nouns in the sentence are: elephants, ears, and fans.
The giant almost flattened the travelers with his gargantuan foot as he walked through the forest.
"The giant stomped on Mark and crushed him."
A planetary nebula consists of gas ejected from old red giant stars.
The bully cowed all the nerds around him since he seemed like a giant next to them.