"Having to have the last word" normally means not letting another person win or finish an argument. Often the person who has to have the last word isn't open to other people's opinions, or admitting they were/are wrong.
Insecure. Lots of things you could call them, but that is probably the most accurate. They are worried they won't be heard or someone will over rule them or make them look foolish. If they get the last word then they win, at least in their minds. Quoting, Robert Heinlen. "Don't try and get the last word, you might." Someone's action may trump your last word. Fist, Baseball bat, gun. Depends on the circumstance.
the last word in the dictionary is zoo
The last word in The Bible is "Amen."
last word fanatic.
The last sound in the word "abate" is "t" (/t/).
In the word "yellow" the last letter is
The first word in volume 1 of the 2010 Encyclopedia Britannica is "Abel," and the last word in the last volume is "zoysia."
The African Luhya term for the English word 'last' is "womwisho".
The Supreme Court has the "last word".
The Last Word - film - was created in 1975.
Last Word Spoken was created in 2000.
Charlotte's last word is "humble."
If you include the epilogue the last word is "smokestacks"