argent vs silverish

argent is a noun but silverish is not a noun.

Word	Noun	Adjective	Verb	Adverb
argent	Yes	Yes	No	No
silverish	No	Yes	No	No

As adjectives, argent and silverish are synonyms defined as:

argent and silverish: of lustrous grey; covered with or tinged with the color of silver

Other synonyms of argent include silver, silvery.

argent (noun)	silverish (noun)
a metal tincture used in heraldry to give a silvery appearance

argent (adjective)	silverish (adjective)
of lustrous grey; covered with or tinged with the color of silver	of lustrous grey; covered with or tinged with the color of silver