groundwork vs foundation

groundwork and foundation both are nouns.

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

As nouns, groundwork and foundation are synonyms defined as:

Other synonyms of groundwork include base, foot, fundament, substructure, understructure.

As nouns, groundwork and foundation are synonyms defined as:

groundwork and foundation: the fundamental assumptions from which something is begun or developed or calculated or explained

Other synonyms of groundwork include base, basis, cornerstone, fundament.

groundwork (noun)	foundation (noun)
preliminary preparation as a basis or foundation	the act of starting something for the first time; introducing something new
lowest support of a structure	lowest support of a structure
the fundamental assumptions from which something is begun or developed or calculated or explained	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