6-Letter Word-Change one or two letters make a new word

trucks

ruckus

tuchus

http://obsessivejew.com/blog/2009/01/26/pain-in-the-tuchus-yiddish-word-of-the-week/

stanch

chaste

chased

detach

thatch

chatty

Chappy

crappy

croupy

Porky’s

Ropers

sniper

Napier

recaps

Pascal

pastel

lepton