bathroom

As an adjective sanitary

is of, or relating to health.

As a noun bathroom is

a room containing a bath where one can bathe.

As nouns the difference between bathroom and diagram

is that bathroom is a room containing a bath where one can bathe while diagram is a plan, drawing, sketch or outline to show how something works, or show the relationships between the parts of a whole.

As a verb diagram is

to represent or indicate something using a diagram.

As nouns the difference between oo and bathroom

is that oo is the Greek letter omega while bathroom is a room containing a bath where one can bathe.