is a specific kind of: period, period of time, time period.

is a broader term that covers: Christian year, church year | Holy Year | New Year | 365 days, common year | 366 days, bissextile year, intercalary year, leap year | off year | off year | calendar year, civil year | financial year, fiscal year | annum | year of grace | Y2K ... show more.

is a part of: decade, decennary, decennium.

derivation: annual, yearly.