Answer:
Volunteer work is important for your health. The Corporation for National and Community Service says that volunteering improves psychological and physical health. Volunteers reap the benefits of feeling a personal sense of accomplishment while building social networks that, in turn, support them in times of stress.
The only noun I know derived from the verb to entomb would be the noun entombment.
It is an abstract noun, which means that it doesn't have a physical shape - you cannot touch it or smell it, just like with love, or hate, or happiness. Entombment is the process of placing a dead body into a tomb, or a grave.
