hairball vs trichobezoar

hairball and trichobezoar both are nouns.

Word	Noun	Adjective	Verb	Adverb
hairball	Yes	No	No	No
trichobezoar	Yes	No	No	No

As nouns, hairball and trichobezoar are synonyms defined as:

hairball and trichobezoar: a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur)

Other synonyms of hairball include hair ball.

hairball (noun)	trichobezoar (noun)
a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur)	a compact mass of hair that forms in the alimentary canal (especially in the stomach of animals as a result of licking fur)