explanation vs foundation

explanation and foundation both are nouns.

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

explanation (noun)	foundation (noun)
thought that makes something comprehensible	the act of starting something for the first time; introducing something new
a statement that makes something comprehensible by describing the relevant structure or operation or circumstances etc.	lowest support of a structure
the act of explaining; making something plain or intelligible	a woman's undergarment worn to give shape to the contours of the body
	the fundamental assumptions from which something is begun or developed or calculated or explained
	education or instruction in the fundamentals of a field of knowledge
	an institution supported by an endowment
	the basis on which something is grounded