by-by-, bye- /baɪ/ prefix 
less important: 
a by-product (=something made in addition to the main product) a by-election (=one held between regular elections)
less important: a by-product (=something made in addition to the main product) a by-election (=one held between regular elections)- instructor
- instrument
- instrumental
- instrumentalist
- instrumentally
- instrumentation
- instrument panel
- insubordinate
- insubordination
- insubstantial
- insufferable
- insufferably
- insufficiency
- insufficient
- insufficiently
- insular
- insularity
- insulate
- insulating tape
- insulation
- insulator
- insulin
- insult
- insulting
- insultingly