Synonyms For "Gaseous" :

2 syllables:

airlike, gassy

3 syllables:

aeriform, gasified, vaporish, vaporized, vaporous, vapourised, vapourish, vapourous

4 syllables:

aerosolised, aerosolized, vaporific, vapourific, volatilised, volatilized

5 syllables:

evaporated