Word parts change

bug + -y (adjective)

Pronunciation change

Noun change

Singular
buggy

Plural
buggies

 
A dune buggy.
  1. (countable) A buggy is a small motor vehicle.

Adjective change

Positive
buggy

Comparative
buggier

Superlative
buggiest

  1. If something is buggy, it is infested with insects.
  2. (computing) If a software is buggy, it contains programming errors.
    This software is so buggy that I don't know how anyone can use it!