sunset

nouns

the time in the evening at which the sun begins to fall below the horizon
antonym
atmospheric phenomena accompanying the daily disappearance of the sun
is a type of (narrower)
a physical phenomenon associated with the atmosphere
the daily event of the sun sinking below the horizon
is a type of (narrower)
an event that recurs at intervals

adjectives

of a declining industry or technology
"sunset industries"
is similar to
of long duration; not new
"old tradition"; "old house"; "old wine"; "old country"; "old friendships"; "old money"
providing for termination
"a program with a sunset provision"
is similar to
coming after all others in time or space or degree or being the only one remaining
"the last time I saw Paris"; "the last day of the month"; "had the last word"; "waited until the last minute"; "he raised his voice in a last supreme call"; "the last game of the season"; "down to his last nickel"