different between tinny vs tunny

English

tin +? -y

tinny (comparative tinnier or more tinny, superlative tinniest or most tinny)

Of or pertaining to or resembling tin.
The object had a tinny appearance.
Pertaining to the thinness and cheapness of tin or similar-looking metals, in contrast to a heavier, more valuable metal.
The shop was filled with tinny tourist geegaws.
Pertaining to a thin, unpleasant sound recalling that of tin being rapped.
The piano was not simply out of tune, but had become downright tinny.
- 2012, Mike Brent, Fiona Dent, The Leader's Guide to Influence
  You might find yourself listening to the sound your car door makes when it shuts. Is it a cheap tinny sound or a strong clunky sound like the VW?

From tin +? -y (diminutive suffix).

tinny (plural tinnies)

From Middle French thon, from Old Occitan ton, from Latin thunnus, from Ancient Greek ?????? (thúnnos), + -y.

tunny (plural tunnies)

Send