nail down vs finalise

nail down and finalise both are verbs.

Word	Noun	Adjective	Verb	Adverb
nail down	No	No	Yes	No
finalise	No	No	Yes	No

As verbs, nail down and finalise are synonyms defined as:

nail down and finalise: make final; put the last touches on; put into final form

Other synonyms of nail down include finalize, settle.

nail down (verb)	finalise (verb)
make final; put the last touches on; put into final form	make final; put the last touches on; put into final form
define clearly
succeed in obtaining a position