approval vs blessing

approval and blessing both are nouns.

Word	Noun	Adjective	Verb	Adverb
approval	Yes	No	No	No
blessing	Yes	No	No	No

As nouns, approval and blessing are synonyms defined as:

Other synonyms of approval include approving.

approval (noun)	blessing (noun)
the formal act of approving	the act of praying for divine protection
a message expressing a favorable opinion	the formal act of approving
a feeling of liking something or someone good	a ceremonial prayer invoking divine protection
acceptance as satisfactory	a short prayer of thanks before a meal
	a desirable state