The study is numismatics.
chromatography
Aesthetics
The term is astronomy.
The scientific field is called entomology.
In botany, morphology is the associated study of plant structures, and eidonomy the study of external structures.
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
Spectator, observer
The word metalworking is one word.
eat, use