Word 1: Sanatorium (san” uh TOR eeuhm, san” uh TOHR uhm)
Meaning 1: An establishment that provides therapy combined with a regimen (as of diet and exercise) for treatment or rehabilitation.
Example Sentence: He recouped fully in six months in the sanatorium.

Word 2: Sanitarium (san” i TAIR eeuhm)
Meaning 1: A hospital for recuperation or for the treatment of chronic diseases.
Example Sentence: The sanitarium had pine trees lined all around it.

Example Sentence using both words:
The fresh air around the sanitarium in the hills is much more pleasant than the concrete walls of the sanatorium.