accidence vs morphology

accidence and morphology both are nouns.

Word	Noun	Adjective	Verb	Adverb
accidence	Yes	No	No	No
morphology	Yes	No	No	No

As nouns, morphology is a hypernym of accidence; that is, morphology is a word with a broader meaning than accidence:

accidence (noun)	morphology (noun)
the part of grammar that deals with the inflections of words	the branch of biology that deals with the structure of animals and plants
	studies of the rules for forming admissible words
	the admissible arrangement of sounds in words
	the branch of geology that studies the characteristics and configuration and evolution of rocks and land forms