tiresome vs boring

tiresome is not a noun while boring is a noun.

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

As adjectives, tiresome and boring are synonyms defined as:

tiresome and boring: so lacking in interest as to cause mental weariness

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

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

tiresome (adjective)	boring (adjective)
so lacking in interest as to cause mental weariness	so lacking in interest as to cause mental weariness