rhabdomancy vs divination

rhabdomancy and divination both are nouns.

Word	Noun	Adjective	Verb	Adverb
rhabdomancy	Yes	No	No	No
divination	Yes	No	No	No

As nouns, divination is a hypernym of rhabdomancy; that is, divination is a word with a broader meaning than rhabdomancy:

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

Other hypernyms of rhabdomancy include foretelling, fortune telling, soothsaying.

rhabdomancy (noun)	divination (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
	a prediction uttered under divine inspiration
	successful conjecture by unusual insight or good luck