Collocations for organ - noun

internal
bodily
important, major, vital
The colon is an important organ for the absorption of nutrients.
to preserve blood flow to the vital organs

abdominal, genital
digestive, olfactory, reproductive, sense, sensory, sex, sexual, etc.
human
donor, replacement
He is waiting for a suitable donor organ.

donate
transplant
harvest
affect, damage

donation, donor
transplant, transplantation
damage, failure

pipe
electric, Hammond™
barrel, mouth
church, fairground (BrE)

pedal, pipe, stop
loft

central, major
the central organs of state

administrative, constitutional (BrE), judicial (esp. BrE), political, security