gascu

Etymology:

gas + -cu

gas: (b.oro) gas; cause to turn gaseous; become gaseous
-cu: (b.nenoj xfik) intransitive verb marker, become, get, turn (into)

Rhyming Words not Ending in -cu

:

cucu: (b) nipple
kawcu: (b) rubber
motsukawcu: (b) eraser, rubber