The likely word is cascade.
The word "portable" serves as a one-word substitute for something that is light and small enough to be carried from one place to another. It conveys the idea of being easy to transport and handle.
The word is "classifieds" (classified ads).
There is no one-word substitute in English for "son-in-law."
The word you want is florist.
A small section of grass is a clump. A wide area of grass is a lawn.
The words for a group of islands may be a chain or an archipelago.
Sportsmanship is a word substitute for spirit of game
a waterfall.
The word metalworking is one word.
eat, use
The word that works is idiot.
what word can I substitute for constitutes