usage vs habit

usage and habit both are nouns.

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

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

usage: 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 usage include Americanism, Anglicism, Britishism, consuetude, couvade, Germanism, use, hijab, rite, ritual.

usage (noun)	habit (noun)
the act of using	excessive use of drugs
accepted or habitual practice	(psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition
the customary manner in which a language (or a form of a language) is spoken or written	a distinctive attire worn by a member of a religious order
	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)

usage (verb)	habit (verb)
	put a habit on