indorsement vs blurb

indorsement and blurb both are nouns.

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

As nouns, indorsement and blurb are synonyms defined as:

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

Other synonyms of indorsement include endorsement.

indorsement (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