去年底

late last year / the end of last year

to go / to go to (a place) / (of a time etc) last / just passed / to send / to remove / to get rid of / to reduce / to be apart from in space or time / to die (euphemism) / to play (a part) / (when used either before or after a verb) to go in order to do sth / (after a verb of motion indicates movement away from the speaker) / (used after certain verbs to indicate detachment or separation)

last year

surname Nian

year / CL:個|个[ge4]

grain / harvest (old) / variant of 年[nian2]

the end of the year / year-end

(equivalent to 的 as possessive particle)

background / bottom / base / end (of the month, year etc) / remnants / (math.) radix / base