In the event you take time to check the definition of the word "thanksgiving" in your dictionary, you will find the following:  Part of speech:  A noun.  Derivation:  From the Anglo‑Saxon word thanc, Meaning: 1.The act of rendering thanks, especially to God.  2. A prayer expressing gratitude.  3. A public acknowledgment or celebration of divine goodness or mercies, a day set apart for making this possible.