backpack vacuum cleaner vs backpack vacuum

backpack vacuum cleaner and backpack vacuum both are nouns.

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

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

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

backpack vacuum cleaner (noun)	backpack vacuum (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.