safebreaker vs safecracker

safebreaker and safecracker both are nouns.

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

As nouns, safebreaker and safecracker are synonyms defined as:

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

Other synonyms of safebreaker include cracksman.

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