backpack vacuum vs backpack vacuum cleaner

backpack vacuum and backpack vacuum cleaner both are nouns.

Word	Noun	Adjective	Verb	Adverb
backpack vacuum	Yes	No	No	No
backpack vacuum cleaner	Yes	No	No	No

As nouns, backpack vacuum and backpack vacuum cleaner are synonyms defined as:

backpack vacuum and backpack vacuum cleaner: a small canister vacuum strapped onto the user's back, commonly used for commercial cleaning.

backpack vacuum (noun)	backpack vacuum cleaner (noun)
a small canister vacuum strapped onto the user's back, commonly used for commercial cleaning.	a small canister vacuum strapped onto the user's back, commonly used for commercial cleaning.