safecracker vs safebreaker

safecracker and safebreaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
safecracker	Yes	No	No	No
safebreaker	Yes	No	No	No

As nouns, safecracker and safebreaker are synonyms defined as:

safecracker and safebreaker: a thief who breaks open safes to steal valuable contents

Other synonyms of safecracker include cracksman.

safecracker (noun)	safebreaker (noun)
a thief who breaks open safes to steal valuable contents	a thief who breaks open safes to steal valuable contents