"Your final words"
Translation:Tus palabras finales
Because finales has several uses depending on where you put it. If you want to use it as an adjective you must place it after the substantive, otherwie you have to use it as a "locución adverbial" or "locución verbal" (adverbial or verbal locution) , which includes the use of one or more prepositions to link the verb, the noun and the adjetive.
Tus is plural, but not for the reason you're thinking. It is my understanding that in Spanish pronouns that show ownership must match the object they show ownership of. An example might be mis padres = my parents mi padre = my parent/father, but mi padres and mis padre would not make sense grammatically.