have a disease; disease / being stiff and not able to move / difficult / suffer / make one suffer

sickness / ill, sick

(medicine, neurology) Alzheimer's disease

a hospital (large medical facility)

(virology, dated) virus

Alternative form of 病原

a sick friend, a friend who is ill / different people who have the same disease (not necessarily friends)

seedbed / plant nursery

nanosecond - a measure of time equal to one billionth of a second. Abbreviation: ns

childhood diseases