custom vs habit

custom and habit both are nouns.

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

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

custom: accepted or habitual practice
habit: (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition

Other hyponyms of custom include Americanism, Anglicism, Britishism, consuetude, couvade, Germanism, use, hijab, rite, ritual.

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

Other hyponyms of custom include wont, Hadith, institution.

custom (noun)	habit (noun)
accepted or habitual practice	excessive use of drugs
habitual patronage	(psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
a specific practice of long standing	a distinctive attire worn by a member of a religious order
money collected under a tariff	attire that is typically worn by a horseback rider (especially a woman's attire)
	an established custom
	the general form or mode of growth (especially of a plant or crystal)

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

custom (verb)	habit (verb)
	put a habit on