dowsing vs fortune telling

dowsing and fortune telling both are nouns.

Word	Noun	Adjective	Verb	Adverb
dowsing	Yes	No	No	No
fortune telling	Yes	No	No	No

As nouns, fortune telling is a hypernym of dowsing; that is, fortune telling is a word with a broader meaning than dowsing:

dowsing: searching for underground water or minerals by using a dowsing rod
fortune telling: the art or gift of prophecy (or the pretense of prophecy) by supernatural means

Other hypernyms of dowsing include divination, foretelling, soothsaying.

dowsing (noun)	fortune telling (noun)
searching for underground water or minerals by using a dowsing rod	the art or gift of prophecy (or the pretense of prophecy) by supernatural means