rotary actuator vs actuator

rotary actuator and actuator both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotary actuator	Yes	No	No	No
actuator	Yes	No	No	No

As nouns, actuator is a hypernym of rotary actuator; that is, actuator is a word with a broader meaning than rotary actuator:

rotary actuator: (computer science) the actuator that moves a read/write head to the proper data track
actuator: a mechanism that puts something into automatic action

rotary actuator (noun)	actuator (noun)
(computer science) the actuator that moves a read/write head to the proper data track	a mechanism that puts something into automatic action