Ascension vs Ascension of the Lord

Ascension and Ascension of the Lord both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ascension	Yes	No	No	No
Ascension of the Lord	Yes	No	No	No

As nouns, Ascension and Ascension of the Lord are synonyms defined as:

Ascension and Ascension of the Lord: (Christianity) celebration of the Ascension of Christ into heaven; observed on the 40th day after Easter

Other synonyms of Ascension include Ascension Day.

Ascension (noun)	Ascension of the Lord (noun)
(New Testament) the rising of the body of Jesus into heaven on the 40th day after his Resurrection	(Christianity) celebration of the Ascension of Christ into heaven; observed on the 40th day after Easter
(Christianity) celebration of the Ascension of Christ into heaven; observed on the 40th day after Easter