rest room: toilet and a sink bathroom: toilet, sink and a shower or a bathing tub sometimes both
One you cook food in, the other you get rid of the food that you ate.
Generally, a washroom has a sink and toilet. A bathroom has a sink, toilet and tub. But the words are often used interchangeably.
Many bathroom scales are spring scales. Yes, there are new "electronic" scales flooding the market, but the venerable spring scale is still around and for good reason. Hooke's law (of elasticity) is...
toliet room has a toilet and its where you go potty. A bathroom is where people bathe and there is NO toliet, just a bath