1. sedulous
The little girl with curly hair is sedulous in drawing a picture.
(marked by care and persistent effort)
2. boycott
The office workers are putting up a boycott.
(to refuse to buy, use or take part in something as a way of protesting)
3. conundrum
How to reach the other side of the maze is really a conundrum.
(a confusing or difficult problem)
4. fracas
A small worm caused a terrible fracas between the roosters.
(a noisy argument or fight)
5. chameleon
It is so cool how the chameleon can change colors.
(a type of lizard that can change the color of its skin to look like the colors that are around it)