piles vs hemorrhoid

piles and hemorrhoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
piles	Yes	No	No	No
hemorrhoid	Yes	No	No	No

As nouns, piles and hemorrhoid are synonyms defined as:

piles and hemorrhoid: venous swelling external or internal to the anal sphincter

Other synonyms of piles include haemorrhoid.

piles (noun)	hemorrhoid (noun)
a large number or amount	venous swelling external or internal to the anal sphincter
venous swelling external or internal to the anal sphincter