Darth [dahrth]
noun
1.
Sci-Fi/Fantasy.
In the fictional Star Wars universe, it is the traditional title of a
Sith Lord or Master, the first part of the new name they take on. It
was once believed to be a condensed version of 'Dark Lord of the Sith',
and thus the reason for the title. In Star Wars, the title is taken on
by most villainous force users as an official title, alongside a
nefarious sounding moniker.
Time Lord [tahym-lawrd]
noun
1.
Sci-Fi/Fantasy. A fictional extraterrestrial race and civilization of
humanoids in the British science fiction television series Doctor Who,
of which the series' main character, the Doctor, is a member. Also, called Gallifreyans, in reference to their home planet of Gallifrey, these advanced aliens are one of the oldest species in the universe and are called "time lords", because of their mastery of time and space. Physically, their outward appearance is identical to humans, but, despite their similarities, Gallifreyans have marked differences. The most obvious difference is that they have twice as many organs of the average human, as well as, a much larger brain. The average Gallifreyan is more reslient, heals much faster, needs far less sleep, etc. They're generally superior in all manners physical and mental, but their most astonish unique ability is their incredible "regeneration" ability.
While, a Gallifreyan ages much slower than a human, if a Gallifreyan is terminally ill they can choose to regenerate. This process sets up a violent and complete metamorphosis that affects their whole bodies and makes them into a completely new person (usually younger in appearance). Each new regeneration brings a new face, a new personality, and other new quirks, but with all of the old experiences.
For these reasons, Gallifreyans are often considered amongst the most immortal beings in the universe and feared/respected across time and space.
Yet, presumably lost in the Time War, only one subject is believed to still exist.