off-line equipment vs auxiliary equipment

off-line equipment and auxiliary equipment both are nouns.

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

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

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

off-line equipment (noun)	auxiliary 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