bombshell vs thunderclap

bombshell and thunderclap both are nouns.

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

As nouns, bombshell and thunderclap are synonyms defined as:

Other synonyms of bombshell include thunderbolt.

bombshell (noun)	thunderclap (noun)
an explosive bomb or artillery shell	a single sharp crash of thunder
a shocking surprise	a shocking surprise
an entertainer who has a sensational effect