STUMPERS VI

A five-letter word having to do with the dead becomes a six-letter word having to do with the living - with the addition of one letter. Both words have two syllables. In the first word, the stress is on the second syllable. The second word (with the added letter) has two meanings - depending on which syllable gets the stress. With the stress on the second syllable, the word means to confine to a designated area. With the stress on the first syllable, the word names someone in training - in some cases, one who might make the difference between the living and the dead.

Answer:

INTER' - to bury

INTERN' - to confine to a designated area
(as the Japanese internment camps of WW II)

IN'TERN - someone in training - as a doctor

Note: The IN'TERN is generally confined to his work area (INTERNED') - an interesting connection between these two stressonyms.