explanation vs intellection

explanation and intellection both are nouns.

Word	Noun	Adjective	Verb	Adverb
explanation	Yes	No	No	No
intellection	Yes	No	No	No

As nouns, intellection is a hypernym of explanation; that is, intellection is a word with a broader meaning than explanation:

explanation: thought that makes something comprehensible
intellection: the process of using your mind to consider something carefully

Other hypernyms of explanation include cerebration, mentation, thinking, thought, thought process.

explanation (noun)	intellection (noun)
thought that makes something comprehensible	the process of using your mind to consider something carefully
a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.
the act of explaining; making something plain or intelligible