calendar week vs week

calendar week and week both are nouns.

Word	Noun	Adjective	Verb	Adverb
calendar week	Yes	No	No	No
week	Yes	No	No	No

As nouns, calendar week and week are synonyms defined as:

calendar week and week: a period of seven consecutive days (usually reckoned to be from Sunday to Saturday, or from Monday to Sunday)

calendar week (noun)	week (noun)
a period of seven consecutive days (usually reckoned to be from Sunday to Saturday, or from Monday to Sunday)	any period of seven consecutive days
	hours or days of work in a calendar week
	a period of seven consecutive days (usually reckoned to be from Sunday to Saturday, or from Monday to Sunday)