An adjective meaning free from error could be flawless or perfect.
Another word for uninfected or disinfected could be unafflicted or aseptic.
There is no one-word substitute in English for "son-in-law."
The one-word substitute for "free from infection" is "sterile." This term is often used in medical contexts to describe an environment, object, or individual that is devoid of viable pathogens. Sterility is crucial in preventing the spread of infections, particularly in surgical and clinical settings.
The word you want is florist.
Sportsmanship is a word substitute for spirit of game
The word metalworking is one word.
eat, use
what word can I substitute for constitutes
The word that works is idiot.
Elevate
Traditionalist
Deaf