Days
Part of speech: adverb
Definition: During the day.
Part of speech: noun
Definition: Any period of 24 hours. life
Example sentence: Nostalgia is a file that removes the rough edges from the good old days.
Years
Part of speech: noun
Definition: A solar year, the time it takes the Earth to complete one revolution of the Sun (between 365.24 and 365.26 days depending on the point of reference).An unusually long time
Example sentence: The years teach much which the days never know.