intense vs main

intense is not a noun while main is a noun.

Word	Noun	Adjective	Verb	Adverb
intense	No	Yes	No	No
main	Yes	Yes	No	No

intense (noun)	main (noun)
	a principal pipe in a system that distributes water or gas or electricity or that collects sewage
	any very large body of (salt) water

intense (adjective)	main (adjective)
possessing or displaying a distinctive feature to a heightened degree	(of a clause) capable of standing syntactically alone as a complete sentence
(of color) having the highest saturation	most important element
extremely sharp or severe	of force; of the greatest possible intensity