Cases of word usage

1) a kind of small, fur-covered animal that is often kept as a pet (cat)

2) to make (a person) a knight; to give (a person) a pet name (dub)

3) (of a personal possession, a pet etc) to be lost (with the belief that it will be found quickly) (go astray)

4) the lungs of sheep, pigs, cattle, used as food for pet animals (lights)