- vapor, vapour - a visible suspension in the air of particles of some substance
--1 is a kind of 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
--2 has particulars: boiling; clouding, clouding up; smoke, smoking