roundworm vs ringworm

roundworm and ringworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
roundworm	Yes	No	No	No
ringworm	Yes	No	No	No

As nouns, roundworm and ringworm are synonyms defined as:

roundworm and ringworm: infections of the skin or nails caused by fungi and appearing as itching circular patches

Other synonyms of roundworm include tinea.

roundworm (noun)	ringworm (noun)
unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic	infections of the skin or nails caused by fungi and appearing as itching circular patches
infections of the skin or nails caused by fungi and appearing as itching circular patches