sole vs fillet of sole

sole and fillet of sole both are nouns.

Word	Noun	Adjective	Verb	Adverb
sole	Yes	Yes	Yes	No
fillet of sole	Yes	No	No	No

As nouns, sole and fillet of sole are synonyms defined as:

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

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

sole (verb)	fillet of sole (verb)
put a new sole on