blacksmith vs smith

blacksmith and smith both are nouns.

Word	Noun	Adjective	Verb	Adverb
blacksmith	Yes	No	No	No
smith	Yes	No	No	No

As nouns, smith is a hypernym of blacksmith; that is, smith is a word with a broader meaning than blacksmith:

blacksmith: a smith who forges and shapes iron with a hammer and anvil
smith: someone who works metal (especially by hammering it when it is hot and malleable)

Other hypernyms of blacksmith include metalworker.

blacksmith (noun)	smith (noun)
a smith who forges and shapes iron with a hammer and anvil	someone who works metal (especially by hammering it when it is hot and malleable)
	someone who works at something specified