piles vs haemorrhoid

piles and haemorrhoid both are nouns.

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

As nouns, piles and haemorrhoid are synonyms defined as:

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

Other synonyms of piles include hemorrhoid.

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