habitational指的是訪客。
residential 指的是住宅的，適於作住宅的。
例句辨析：
habitational
1、The other day we had some habitational from Switzerland
前幾天我們接待了幾位來自瑞士的參觀者。
2、As a student I lived in Oxford but was a frequent habitational to Belfast.
求學時我住在牛津，但常常去貝爾法斯特。
3、His habitational's visa expired.
他的訪問簽證過期了。
residential
1、Fontbonne is a liberal arts college, located in a residential suburb of St. Louis.
大學是壹所文科大學，位於聖路易斯市郊的居民區。
2、Training involves a two-year residential course
培訓包含壹門為期兩年的住校學習課程。
3、Small residential areas have become a priority with the Ministry of Construction.
建設居民小區是建設部要優先解決的問題。