List all the plural words which replace f with v and add es.



altos female singing voices
beliefs principals of a faith
chiefs leaders; those in charge
dwarfs people, plants or animals whose size is noticeably smaller than usual
echoes sounds that are repeated; sound waves reflected back from a surface
Eskimos groups of people who live in coastal Arctic regions
halves two pieces that together make a whole
handkerchiefs pieces of cloth used as facial wipes or for decoration
heroes people others "look up" to for courageous or noble acts
pianos musical instruments with keyboards operating hammers which strike strings
potatoes vegetables in the tuber family
proofs group of photographs from which final pictures are produced
shelves pieces of wood attached to walls horizontally to hold items
solos songs sung by one person
sopranos high female voices
thieves those who steal
tomatoes edible red fruit
wives women who are married