digestion vs biological process

digestion and biological process both are nouns.

Word	Noun	Adjective	Verb	Adverb
digestion	Yes	No	No	No
biological process	Yes	No	No	No

As nouns, biological process is a hypernym of digestion; that is, biological process is a word with a broader meaning than digestion:

digestion: the organic process by which food is converted into substances that can be absorbed into the body
biological process: a process occurring in living organisms

Other hypernyms of digestion include organic process.

digestion (noun)	biological process (noun)
learning and coming to understand ideas and information	a process occurring in living organisms
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