sex bomb vs sex kitten

sex bomb and sex kitten both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex bomb	Yes	No	No	No
sex kitten	Yes	No	No	No

As nouns, sex bomb and sex kitten are synonyms defined as:

sex bomb and sex kitten: a young woman who is thought to have sex appeal

Other synonyms of sex bomb include sexpot.

sex bomb (noun)	sex kitten (noun)
a young woman who is thought to have sex appeal	a young woman who is thought to have sex appeal