Lavatory or lavatory means a washroom, a bathroom, or a room with a basin or sink--
Teacher, may I go to the lavatory?
There is a lavatory on one side of the visiting room.
Laboratory or laboratory means a room equipped for scientific experiments, observations, or investigations--
The old scientist has a real laboratory upstairs, with all kinds of equipment.
The doctor sends the specimens to a laboratory for analysis.
Now that you know that, you can say--
"Make sure to wash your nin the lavatory after using the chemicals in the laboratory."
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