see below
Explanation:
14. Wolf-wolves , ox-oxen, piano-pianos
15. poet-poetess, princess-prince, student-studentessa in italian
16.mouse-mice
tooth-teeth
ox-oxen
inch-inches
potato-potatoes
17 peacock-peafowl or peahen
dog-it's called вітch
son-daughter
actor-actress
man-woman