I would say yes ... for these simple reason.
In the Bible, every time we read of a regular angel, archangel, a cherub or seraph, we understand that these are role descriptors ... were only 'Michael' is used as a proper name. In either case, we have to come to the conclusion that all spirit creatures (a side from God) are all 'angels', as its a term to describe the nature of their metaphysical lifeforms.
Some may vary in power, but that's ok ... just as Arnold Schwarzenegger and you are still called 'human'.