thunderbolt vs thunderclap

thunderbolt and thunderclap both are nouns.

Word	Noun	Adjective	Verb	Adverb
thunderbolt	Yes	No	No	No
thunderclap	Yes	No	No	No

As nouns, thunderbolt and thunderclap are synonyms defined as:

Other synonyms of thunderbolt include bombshell.

thunderbolt (noun)	thunderclap (noun)
a shocking surprise	a single sharp crash of thunder
a discharge of lightning accompanied by thunder	a shocking surprise