Word Request – A Food That Doesn’t Have Enough Salt

"Explosion" and "Blast" 100% work in this situation.

The explosion sound made from the bomb was extremely loud.

The blast from the bomb was extremely loud.

If these words become too repetitive I suggest using onomatopoeias.

Onomatopoeias are words that express a sound and could be used as an interjection at the beginning of the sentence.

Boom! The bomb went off after the minute was up.

The "boom" at the beginning of the sentence could be replaced by a variety of different onomatopoeias. Such as "boosh", "bam".

For further list of these words see: List of Onomatopoeias

To sum up:

The verb to shy is used to express a sudden movement especially of an animal:

(shies, shying, shied, shied BrE /ʃaɪd/ ; NAmE /ʃaɪd/)

• [intransitive] shy (at something) (especially of a horse) to turn away with a sudden movement because it is afraid or surprised:

  • My horse shied at the unfamiliar noise. Her horse shied violently at a gorse bush.

But probably its more common usage is in the idiomatic expression:

shy away (from something):

• to avoid doing something because you are nervous or frightened:

  • Hugh never shied away from his responsibilities. The newspapers have shied away from investigating the story.

As noted there are other less common, outdated usages:

• "to throw (a missile) with a jerk or toss," 1787, colloquial, of unknown origin and uncertain connection to shy (adj.).

• "to recoil," 1640s, from shy (adj.).

Note also the expression coconut shy:

• a game at a fair where you throw balls at a row of coconuts and try to knock them down to win them

OLD, Etymonline