The scientific field is called entomology.
One who studies insects
The study is numismatics.
chromatography
Aesthetics
The term is astronomy.
In botany, morphology is the associated study of plant structures, and eidonomy the study of external structures.
I believe the word you are looking for is Horology, which is really the scientific study of watches and time measurement. A watch professional is sometimes referred to as a horologist.
One who studies insects is an Entomologist.
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 metalworking is one word.
eat, use