-ID words which have a corresponding -OR word meaning "the state of
being _____ID":

ALGID
CANDID
FERVID
FETID
FOETID
HORRID
LANGUID
PALLID
RANCID
RIGID
SAPID
SORDID
SPLENDID
SQUALID
STUPID
TORPID
TUMID
TURGID
VAPID

-ID words that are good if you change the ending to -OR but whose
meanings aren't predictable in the same way:

DID
FLUID
FID
GID
HUMID
KID
LIQUID
MID
MUCID
ID
PHOSPHID
TABID
VALID