One single word can have other words that are synonymous in meaning.
The following is an illustration:
Explode (sound like a bomb or land mine erupting, which feels scary)
Flare up (the word “up” gives an impression that the temperature is rising)
These are words with meaning quite similar but the intensity is definitely different.
The level of intensity will give reader a different feeling.
If I say that I am pissed off compared to I want to explode. Which word gives great emotional intensity?