determine vs nail down

determine and nail down both are verbs.

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

As verbs, nail down is a hyponym of determine; that is, nail down is a word with a more specific, narrower meaning than determine:

Other hyponyms of determine include narrow, narrow down, peg down, pin down, specify.

determine (verb)	nail down (verb)
reach, make, or come to a decision about something	make final; put the last touches on; put into final form
fix conclusively or authoritatively	define clearly
shape or influence; give direction to	succeed in obtaining a position
fix in scope; fix the boundaries of
establish after a calculation, investigation, experiment, survey, or study
find out, learn, or determine with certainty, usually by making an inquiry or other effort
decide upon or fix definitely
settle conclusively; come to terms