Interesting question. I think there are a lot of answers for this one. Here are some of them:
boat
coat
goat
moat
A hurry change one letter
Walk
Bettered is the only one I could think of haha
length
An octave is made up of notes spanning from A to G, from one A to the next A is an octave, and the word 'noat' is spelled 'note'.
There isn't one!! Not true... Tangle rhymes with triangle, and begins with the letter T! You're welcome in advance =)
Slate. And why are you asking this? O-o
how do you change disaster to mean one letter at a time
strange change
Nothing rhymes with one
Nothing rhymes with one
The word "pen" would change to "men" if one letter is altered.