steel gray vs Davy's gray

steel gray and Davy's gray both are nouns.

Word	Noun	Adjective	Verb	Adverb
steel gray	Yes	No	No	No
Davy's gray	Yes	No	No	No

As nouns, steel gray and Davy's gray are synonyms defined as:

Other synonyms of steel gray include Davy's grey, iron blue, steel grey.

steel gray (noun)	Davy's gray (noun)
slightly purplish or bluish dark grey	slightly purplish or bluish dark grey