paper trail vs written account

paper trail and written account both are nouns.

Word	Noun	Adjective	Verb	Adverb
paper trail	Yes	No	No	No
written account	Yes	No	No	No

As nouns, written account is a hypernym of paper trail; that is, written account is a word with a broader meaning than paper trail:

Other hypernyms of paper trail include written record.

paper trail (noun)	written account (noun)
the written evidence of someone's activities	a written document preserving knowledge of facts or events