auxiliary equipment vs off-line equipment

auxiliary equipment and off-line equipment both are nouns.

Word	Noun	Adjective	Verb	Adverb
auxiliary equipment	Yes	No	No	No
off-line equipment	Yes	No	No	No

As nouns, auxiliary equipment and off-line equipment are synonyms defined as:

auxiliary equipment and off-line equipment: electronic equipment not in direct communication (or under the control of) the central processing unit

auxiliary equipment (noun)	off-line equipment (noun)
electronic equipment not in direct communication (or under the control of) the central processing unit	electronic equipment not in direct communication (or under the control of) the central processing unit