theft vs thievery

theft and thievery both are nouns.

Word	Noun	Adjective	Verb	Adverb
theft	Yes	No	No	No
thievery	Yes	No	No	No

As nouns, theft and thievery are synonyms defined as:

Other synonyms of theft include larceny, stealing, thieving.

theft (noun)	thievery (noun)
the act of taking something from someone unlawfully	the act of taking something from someone unlawfully