FALSE PLURALS II

DAMAGED GOODIES
Tucker Smith

The plural of PART is PARTS, but if you incorrectly spell the plural as PARTIES, you would have a valid word (the plural of PARTY), but a false plural of PART. Can you think of any other words that would yield false plurals in this way?

(Possible) Answers:

TAX - TAXIES
COP - COPIES
ARM - ARMIES
FAIR - FAIRIES
BELL - BELLIES