RichThesaurus
pitter-patter
vs
rat-a-tat
pitter-patter
noun
A soft, percussive sound, as of tiny feet, or of rain on a rooftop.
rat-a-tat
How often have the words
pitter-patter
and
rat-a-tat
occurred in a corpus of books?
(source:
Google Ngram Viewer
)