petrel
How about: 'half-size.'
Villa
Ern
A word that starts with "d" and means a loud noise is din.
Depends a lot on what meaning of small you want! Some options for various definitions: baby/babyish, bantam, belittled, bitty, button.
Brook
How about: 'half-size.'
shed
tributary
scrap
don't you just mean 'micro'
part??????
trace
Villa
tuft
A word that starts with the letter A and means move is:ambulate
Ern