The Word is:”week”
noun: week; plural noun: weeks
a period of seven days.
“she has an art class twice a week”
“I work during the week, so I can only get to this shop on Saturdays”
“she works a 48-hour week”
used after the name of a day to indicate that something will happen seven days after that day.
“the programme will be broadcast on Sunday week”
Source credit: Google