month

nouns

one of the twelve divisions of the calendar year
"he paid the bill last month"
is derived from
a time unit of approximately 30 days
"he was given a month to pay the bill"
is derived from
is a part of
the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun
"a Martian year takes 687 of our days"
is a type of (narrower)
a unit for measuring time periods