Bosher, dosher, osher and sacher
dasher ; washer ; splasher
"Glosser", "posher", "masher" and "closer" all rhyme with "washer".
No, do not expose your paintball gun to water.
If you mean end rhyme, 'fun' rhymes.
Smart gun
blowgun
The devils gun
caffiened nun
big bum
electron gun, favorite son, submachine gun, cinnamon bun
One word that rhymes with pun is "fun."
spun fun shun gun none