worrying vs distressing

worrying is a noun but distressing is not a noun.

Word	Noun	Adjective	Verb	Adverb
worrying	Yes	Yes	No	No
distressing	No	Yes	No	No

As adjectives, worrying and distressing are synonyms defined as:

Other synonyms of worrying include distressful, disturbing, perturbing, troubling, worrisome.

worrying (noun)	distressing (noun)
the act of harassing someone
the act of moving something by repeated tugs or pushes

worrying (adjective)	distressing (adjective)
causing distress or worry or anxiety	bad; unfortunate
	causing distress or worry or anxiety