sole vs gray sole

sole and gray sole both are nouns.

Word	Noun	Adjective	Verb	Adverb
sole	Yes	Yes	Yes	No
gray sole	Yes	No	No	No

As nouns, gray sole is a hyponym of sole; that is, gray sole is a word with a more specific, narrower meaning than sole:

Other hyponyms of sole include grey sole, English sole, lemon sole.

sole (noun)	gray sole (noun)
right-eyed flatfish; many are valued as food; most common in warm seas especially European	greyish-white flesh of a flatfish
the underside of footwear or a golf club
the underside of the foot
lean flesh of any of several flatfish

sole (adjective)	gray sole (adjective)
being the only one; single and isolated from others
not divided or shared with others

sole (verb)	gray sole (verb)
put a new sole on