bumf vs reading material

bumf and reading material both are nouns.

Word	Noun	Adjective	Verb	Adverb
bumf	Yes	No	No	No
reading material	Yes	No	No	No

As nouns, reading material is a hypernym of bumf; that is, reading material is a word with a broader meaning than bumf:

bumf: reading materials (documents, written information) that you must read and deal with but that you think are extremely boring
reading material: written material intended to be read

Other hypernyms of bumf include reading.

bumf (noun)	reading material (noun)
reading materials (documents, written information) that you must read and deal with but that you think are extremely boring	written material intended to be read