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Noun vapour has 2 senses
vapor, vapour - a visible suspension in the air of particles of some substance--1 is a kind of depression; suspension; depression; suspension
 --1 has particulars: steam; water vapor, water vapour
 
vaporization, vaporisation, vapor, vapour, evaporation - the process of becoming a vapor--2 is a kind of phase change, phase transition, state change, physical change; phase change, phase transition, state change, physical change
 --2 has particulars: boiling; clouding, clouding up; smoke, smoking
 
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