jury vs grand jury

jury and grand jury both are nouns.

Word	Noun	Adjective	Verb	Adverb
jury	Yes	No	No	No
grand jury	Yes	No	No	No

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

jury: a body of citizens sworn to give a true verdict according to the evidence presented in a court of law
grand jury: a jury to inquire into accusations of crime and to evaluate the grounds for indictments

Other hyponyms of jury include hung jury, petit jury, petty jury, blue ribbon jury, special jury.

jury (noun)	grand jury (noun)
a body of citizens sworn to give a true verdict according to the evidence presented in a court of law	a jury to inquire into accusations of crime and to evaluate the grounds for indictments
a committee appointed to judge a competition