whereas is kind of formal;but,is a frequently-used word.
The difference between "them" and "those" is that 'them' is an objective pronoun whereas 'those' is a demonstrative pronoun.
A tourist is the participant of tourism, whereas tourism is the actual act.
A tourist is the participant of tourism, whereas tourism is the actual act.
You hold a cello between your knees, whereas you hold a viola/violin between your chin and shoulder.
Windows is an operating system whereas Java is a programming language. They are entirely different.
The difference is that an Imperial gallon exists, whereas a 'metric' gallon doesn't.
A square has 4 equal sides whereas a rectangle has length and width of different sizes.
The difference between complex and complicated is that 'complex' refers to many different components, whereas "complicated" refers to a high level of difficulty.
A Photo-diode is used to receive light. whereas the L.E.D. is a Light Emitting Diode.
Swash is movement of water up the beach whereas backswash is movement of water down the beach.
A reflection is a mirror image of a shape whereas a translation moves an image to a different place
Power is the rate of doing work or delivering energy whereas energy is the capacity for doing work.