sole vs grey sole

sole and grey sole both are nouns.

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

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

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

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

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