usage vs hijab

usage and hijab both are nouns.

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

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

usage: accepted or habitual practice
hijab: the custom in some Islamic societies of women dressing modestly outside the home

Other hyponyms of usage include Americanism, Anglicism, Britishism, consuetude, couvade, Germanism, habit, use, rite, ritual.

usage (noun)	hijab (noun)
the act of using	the custom in some Islamic societies of women dressing modestly outside the home
accepted or habitual practice	a headscarf worn by Muslim women; conceals the hair and neck and usually has a face veil that covers the face
the customary manner in which a language (or a form of a language) is spoken or written