ADJ

internal
important, vital
The eyes are an important organ of balance. to preserve blood flow to the brain and the other vital organs
abdominal, genital
digestive, olfactory, reproductive, sense/sensory, sex/sexual, etc.
human
donor
waiting for a suitable donor organ

VERB + ORGAN

donate
transplant

ORGAN + NOUN

donation, donor
transplant, transplantation

ADJ

pipe
mechanical
electric, electronic, Hammond (R)
barrel, mouth
church, fairground

ORGAN + NOUN

pedal, pipe, stop
loft

ADJ

central, major
the central organs of state
administrative, constitutional, economic, judicial, legislative, political, security
party