salter vs salt merchant

salter and salt merchant both are nouns.

Word	Noun	Adjective	Verb	Adverb
salter	Yes	No	No	No
salt merchant	Yes	No	No	No

As nouns, salter and salt merchant are synonyms defined as:

salter (noun)	salt merchant (noun)
someone who makes or deals in salt	someone who makes or deals in salt
someone who uses salt to preserve meat or fish or other foods