cherries, strawberries, berries, blueberries, cranberries...
Most berries would work. I'm not sure of any others though.
Cookies and jellies
for the first word: Beef
auctioneerbeercareercheerdeerengineerfreerjeeroverseerpeerpioneerpuppeteersneersteerseersheervolunteer
registrar
bracer
an African city - eight letters - ending in U
parties,
ies of course
pap
The word "chimney" is considered an irregular plural noun because its plural form is simply "chimneys," without adding "ies." This is a common exception in English grammar.
ski, chili, xi, chi, qi
tofu
English nouns ending in -y generally form the plural in -ies: follies
nouns ending in -ies = species / seriesnouns that end in -s = crossroads / barracks / headquarters / means / Swiss
Celery, cherry, pastry, turkey are food words with six letters ending with y.
for the first word: Beef
Words that drop the ending "y" and add "-ies" are those for which the penultimate letter of the word is a consonant. As the penultimate letter of keys is a vowel, the final consonant y is retained and an s is added at the end.
The word injury, like many singular nouns ending in Y, forms an -ies plural, injuries.