Six letter word - change only one letter

Garden - Grades

Grades - Gander

Gander - Neared

Neared - Feared

Feared - Faired

Faired - derail

Derail - Dearly

Dearly - Parley

Parley - Really

Really - Realty

Realty - Treaty

Treaty - earthy

Earthy - threat

Threat - Treaty

Treaty - Pretty

Pretty - Patter

Patter - Repeat

Repeat - parted

Parted - Farted

Farted - Trader

Trader - Darted

Darted - Parted

Parted - tapped

Tapped - Topped