custom vs Hadith

custom and Hadith both are nouns.

Word	Noun	Adjective	Verb	Adverb
custom	Yes	Yes	No	No
Hadith	Yes	No	No	No

As nouns, Hadith is a hyponym of custom; that is, Hadith is a word with a more specific, narrower meaning than custom:

custom: a specific practice of long standing
Hadith: (Islam) a tradition based on reports of the sayings and activities of Muhammad and his companions

Other hyponyms of custom include habit, wont, institution.

custom (noun)	Hadith (noun)
accepted or habitual practice	(Islam) a tradition based on reports of the sayings and activities of Muhammad and his companions
habitual patronage
a specific practice of long standing
money collected under a tariff

custom (adjective)	Hadith (adjective)
made according to the specifications of an individual