Terranaut

noun
The intrepid breed of men that go down into the uncharted seas of time gas below Earth’s crust.
Origin
Derived from terra (ground) and nautēs (traveller).
Source
The Night That All Time Broke Out

Chrownotransductionology

noun
Temporal slippage induced by chrownons; in other words: timely travel.
Origin
Professor Gladys Chrowdingler, discoverer of the chrownon.
Source
Automated Alice

Tempunaut

noun
Crewman aboard a time-travelling vessel.
Origin
Derived from tempus (time) and nautēs (sailor).
Source
A Little Something for Us Tempunauts

Looper

noun
An assassin hired to kill victims transported back in time from the future.
Source
Looper