Sweller

rare. [f. SWELL v. + -ER¹.] One who or that which swells.

c. 1374.  Chaucer, Boeth., III. pr. vi. (1868), 77. O glorie glorie,… þou nart no þing ellys to þousandes of folkes but a gret sweller of eres [orig. auribus inflatio magna].