bombshell vs thunderbolt

bombshell and thunderbolt both are nouns.

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

As nouns, bombshell and thunderbolt are synonyms defined as:

Other synonyms of bombshell include thunderclap.

bombshell (noun)	thunderbolt (noun)
an explosive bomb or artillery shell	a shocking surprise
a shocking surprise	a discharge of lightning accompanied by thunder
an entertainer who has a sensational effect