Godan verbs can have nouns appended to them in order to turn them into a new noun. This is achieved by performing an ใ-stem transformation and appending the desired noun.1
Example
่ฒทใ (buy) โ ่ฒทใใใฎ (thing for buying)
Info
่ฒทใ is transformed by shifting from the ใ-stem to the ใ-stem.ใThe desired noun is then appended.