RichThesaurus
drop in the ocean
vs
drop in the sea
drop in the ocean
noun
A very small or insignificant amount; something of little importance.
drop in the sea
noun
A very small or insignificant amount; something of little importance.
How often have the words
drop in the ocean
and
drop in the sea
occurred in a corpus of books?
(source:
Google Ngram Viewer
)