髓 ⇒
骨髓 gǔsuǐ, bone marrow (medulla ossea)
精髓 jīngsuǐ, marrow/pith/quintessence/essence
脊髓 jǐsuǐ, spinal cord/medulla spinalis
髓 suǐ, marrow/essence/quintessence/pith (soft interior of plant stem)
脑髓 nǎosuǐ, [腦髓], brain tissue/gray matter/brain/medulla
骨髓炎 脊髓炎 jǐsuǐyán, myelitis/inflammation of spinal cord
延髓 yánsuǐ, medulla oblongata (the lower half of the brainstem)
牙髓 yásuǐ, tooth pulp