Deliberately exaggerating and describing things other than the facts is called exaggeration.

For example:

There was a shower, and the raindrops were as big as rotten plums from the beginning, which hurt people. (Jin Zenghao, Wild Species)

After hundreds of years of waiting, the door of the operating room opened and she saw a bed with wheels under it. Lao Zhou is still lying on it, with a white cloth on his face. (Ping Shu "A")

2. What is metaphor?

Metaphor is a rhetorical method of analogy with similar things.

What is compared is called ontology, what is compared is called metaphor, and the words connecting the two are called metaphor. For example:

She has brown curly hair, a small round face, lively eyes and a smart mouth. Dressed in very bright clothes-painted shoes, green stockings, a silver-red silk coat and a velvet apron with purple sauce-she stood slim like a tulip in the breeze. (Xu Zhimo's Mansfield)