A verb is a doing word. 10 examples are:
Estimate, lived, encountered, captured, face, kill, ground, believe, cure and snapped.
A noun is an animal, place, person, object etc. 10 examples are:
Sumatran Rhinoceros, scientists, Borneo, Asia, poachers, horns, powder, photos, conservationists and footprints.
An adjective is a feature of a noun. 10 examples are:
Endangered, southern, female, safely, smallest, serious, mistakenly, hidden, last and captured.