offing vs main

offing and main both are nouns.

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

offing (noun)	main (noun)
the part of the sea that can be seen from the shore and is beyond the anchoring area	a principal pipe in a system that distributes water or gas or electricity or that collects sewage
the near or foreseeable future	any very large body of (salt) water

offing (adjective)	main (adjective)
	(of a clause) capable of standing syntactically alone as a complete sentence
	most important element
	of force; of the greatest possible intensity