boring vs tiresome

boring is a noun but tiresome is not a noun.

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

As adjectives, boring and tiresome are synonyms defined as:

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

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

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

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