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.
Sent is past tense, whereas Send is future tense.
The rhyme scheme is different. A Shakespearean sonnet is ababcdcdefefgg whereas a Spenserian is ababbcbccdcdee.