substructure vs construction

substructure and construction both are nouns.

Word	Noun	Adjective	Verb	Adverb
substructure	Yes	No	No	No
construction	Yes	No	No	No

substructure (noun)	construction (noun)
lowest support of a structure	the act of constructing something
the basic structure or features of a system or organization	the commercial activity involved in repairing old structures or constructing new ones
	drawing a figure satisfying certain conditions as part of solving a problem or proving a theorem
	a thing constructed; a complex entity constructed of many parts
	the creation of a construct; the process of combining ideas into a congruous object of thought
	an interpretation of a text or action
	a group of words that form a constituent of a sentence and are considered as a single unit