tedious vs boring

tedious is not a noun while boring is a noun.

Word	Noun	Adjective	Verb	Adverb
tedious	No	Yes	No	No
boring	Yes	Yes	No	No

As adjectives, tedious and boring are synonyms defined as:

Other synonyms of tedious include deadening, dull, ho-hum, irksome, slow, tiresome, wearisome.

tedious (noun)	boring (noun)
	the act of drilling a hole in the earth in the hope of producing petroleum
	the act of drilling

tedious (adjective)	boring (adjective)
using or containing too many words	so lacking in interest as to cause mental weariness
so lacking in interest as to cause mental weariness