Why do most of the stuff/equipment we use cease beside "tor" at the lapse of their identify?

such as alternator, generator, motor, and operator plus more that i forgot. im wondering if these three letters originate from like mag for magnet from the greeks.
Answers:
-tor is a suffix from Latin. Senator, gladiator, stentor, etc.. A noun related to what someone/something is or does. "Terminator."
-tor

a suffix found in loanwords from Latin, forming personal agent nouns from verbs and, less commonly, from nouns: dictator; genitor; janitor; spokesperson; victor.
Origin:
< L -tor (s. -tōr-), c. Gk -tōr (s. -tor-), Skt -tar-

http://dictionary.quotation.com/search?q…
The suffix "ator," (from Latin) forms masculine nouns from verbs, and usually indicates individuals, machines,or instruments that perform the action of the platform word.
Elevator
Generator
Dictator
Gladiator
Aviator


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