smasher vs blockbuster

smasher and blockbuster both are nouns.

Word	Noun	Adjective	Verb	Adverb
smasher	Yes	No	No	No
blockbuster	Yes	No	No	No

As nouns, blockbuster is a hyponym of smasher; that is, blockbuster is a word with a more specific, narrower meaning than smasher:

smasher: a conspicuous success
blockbuster: an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel)

Other hyponyms of smasher include megahit, smash hit, sleeper.

smasher (noun)	blockbuster (noun)
a conspicuous success	an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel)
a very attractive or seductive looking woman	a large bomb used to demolish extensive areas (as a city block)
a person who smashes something