grand larceny vs theft

grand larceny and theft both are nouns.

Word	Noun	Adjective	Verb	Adverb
grand larceny	Yes	No	No	No
theft	Yes	No	No	No

As nouns, theft is a hypernym of grand larceny; that is, theft is a word with a broader meaning than grand larceny:

grand larceny: larceny of property having a value greater than some amount (the amount varies by locale)
theft: the act of taking something from someone unlawfully

Other hypernyms of grand larceny include larceny, stealing, thievery, thieving.

grand larceny (noun)	theft (noun)
larceny of property having a value greater than some amount (the amount varies by locale)	the act of taking something from someone unlawfully