learning vs digestion

learning and digestion both are nouns.

Word	Noun	Adjective	Verb	Adverb
learning	Yes	No	No	No
digestion	Yes	No	No	No

As nouns, digestion is a hyponym of learning; that is, digestion is a word with a more specific, narrower meaning than learning:

learning (noun)	digestion (noun)
the cognitive process of acquiring skill or knowledge	learning and coming to understand ideas and information
profound scholarly knowledge	the organic process by which food is converted into substances that can be absorbed into the body
	the process of decomposing organic matter (as in sewage) by bacteria or by chemical action or heat