yet

Yet means at this time, up to now or at a future time. (adverb)

An example of yet is someone not getting to take a walk before dark, such as "It is dark but he has not taken his walk yet."
An example of yet is someone possibly getting to take a walk after dark, such as "He might yet get to take his walk after dark."

Yet means nevertheless or but. (conjunction)

An example of yet is although a hiker has back pain they continue their hike up Mount Everest.

See yet in Webster's New World College Dictionary