pinworm vs threadworm

pinworm and threadworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
pinworm	Yes	No	No	No
threadworm	Yes	No	No	No

As nouns, pinworm and threadworm are synonyms defined as:

pinworm and threadworm: small threadlike worm infesting human intestines and rectum especially in children

Other synonyms of pinworm include Enterobius vermicularis.

pinworm (noun)	threadworm (noun)
small threadlike worm infesting human intestines and rectum especially in children	small threadlike worm infesting human intestines and rectum especially in children