swelling - noun

an abnormal protuberance or localized enlargement

something that bulges out or is protuberant or projects from its surroundings

the increase in volume of certain substances when they are heated (often accompanied by release of water)

swelling - thesaurus

bulge   bump   excrescence   extrusion   gibbosity   gibbousness   hump   intumescence   intumescency   jut   lump   prominence   protrusion   protuberance   puffiness