Change one letter.

[Mottie]

List

 

[Slime]

Lisp.

 

[Justin Passing]

LISS

 

[Mottie]

Lass

 

[Justin Passing]

LASK

going for the less common....
I will consider you boring if you go Bask, cask, hask, lack, lask mask, task,lank lark, lash last

There is an obvious slightly less common one at least...

 

[Slime]

Lash.

 

[Justin Passing]

Lase

 

[Slime]

Lose.

 

[Mottie]

Lost

 

[Justin Passing]

losh

 

[Slime]

Posh.

 

[Mottie]

Cosh

 

[Slime]

Cost.

 

[Mottie]

Cast

 

[Slime]

Cyst.