There is no one-word substitute in English for "son-in-law."
The word you want is florist.
Sportsmanship is a word substitute for spirit of game
The word "fear" has one syllable.
The word metalworking is one word.
eat, use
what word can I substitute for constitutes
The word that works is idiot.
Elevate
A walker is a pedestrian.
Traditionalist
Omnipresent