salt shaker vs saltshaker

salt shaker and saltshaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
salt shaker	Yes	No	No	No
saltshaker	Yes	No	No	No

As nouns, salt shaker and saltshaker are synonyms defined as:

salt shaker and saltshaker: a shaker with a perforated top for sprinkling salt

salt shaker (noun)	saltshaker (noun)
a shaker with a perforated top for sprinkling salt	a shaker with a perforated top for sprinkling salt