You have to put words that have the same root word as those words
For example:
Floral, florero, florista, floristería
(Flowery, flower vase, florist, florist)
The root word is flor (flower)
Or
Coloridos, colorear, tricolor
(Colorful, color, tricolor)
The root word is color
I hope you can understand my explanation, it can be very complicated :)