endorsement vs blurb

endorsement and blurb both are nouns.

Word	Noun	Adjective	Verb	Adverb
endorsement	Yes	No	No	No
blurb	Yes	No	No	No

As nouns, endorsement and blurb are synonyms defined as:

endorsement and blurb: a promotional statement (as found on the dust jackets of books)

Other synonyms of endorsement include indorsement.

endorsement (noun)	blurb (noun)
the act of endorsing	a promotional statement (as found on the dust jackets of books)
formal and explicit approval
a promotional statement (as found on the dust jackets of books)
a speech seconding a motion
a signature that validates something