whilst

US /waɪlst/
UK /waɪlst/
"whilst" picture
1.

at the same time as something else is happening; while

:
She was singing whilst she worked.
He reads a book whilst waiting for the bus.
2.

in contrast or comparison to the fact that; whereas

:
Some people prefer coffee, whilst others prefer tea.
He is very tall, whilst his brother is quite short.