statement vs last word

statement and last word both are nouns.

Word	Noun	Adjective	Verb	Adverb
statement	Yes	No	No	No
last word	Yes	No	No	No

As nouns, last word is a hyponym of statement; that is, last word is a word with a more specific, narrower meaning than statement:

statement (noun)	last word (noun)
a message that is stated or declared; a communication (oral or written) setting forth particulars or facts etc	elegance by virtue of being fashionable
a document showing credits and debits	the final statement in a verbal argument
a fact or assertion offered as evidence that something is true	an authoritative statement
(computer science) a line of code written as part of a computer program
(music) the presentation of a musical theme
a nonverbal message
the act of affirming or asserting or stating something