indorsement vs secondment

indorsement and secondment both are nouns.

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

As nouns, indorsement and secondment are synonyms defined as:

Other synonyms of indorsement include endorsement, second.

indorsement (noun)	secondment (noun)
the act of endorsing	the detachment of a person from their regular organization for temporary assignment elsewhere
formal and explicit approval	a speech seconding a motion
a promotional statement (as found on the dust jackets of books)
a speech seconding a motion
a signature that validates something