secondment vs endorsement

secondment and endorsement both are nouns.

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

As nouns, secondment and endorsement are synonyms defined as:

Other synonyms of secondment include indorsement, second.

secondment (noun)	endorsement (noun)
the detachment of a person from their regular organization for temporary assignment elsewhere	the act of endorsing
a speech seconding a motion	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