silverside vs silversides

silverside and silversides both are nouns.

Word	Noun	Adjective	Verb	Adverb
silverside	Yes	No	No	No
silversides	Yes	No	No	No

As nouns, silverside and silversides are synonyms defined as:

silverside and silversides: small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States

silverside (noun)	silversides (noun)
small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States	small fishes having a silver stripe along each side; abundant along the Atlantic coast of the United States
	the common North American shiner