Jman: I don't think grocery is even an English word, but idk anyways... so assuming it is, English is a fucked up language that has many exceptions.
Also, I wouldn't rely on Google Translate for how to pronounce words...
Don: You're Swiss, argument invalid.
Joking of course.OP:
grosheries
But different areas probably pronounce it differently, similar to how some words in English are pronounced differently in Canada than they are America.
The area I live in has always pronounced it grosheries.