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
eat, use
The word that works is idiot.
Elevate
A walker is a pedestrian.
Traditionalist
Omnipresent
One word is reprobate.
The word you are looking for is epitaph.
The word is contemporary.