show bill vs posting

show bill and posting both are nouns.

Word	Noun	Adjective	Verb	Adverb
show bill	Yes	No	No	No
posting	Yes	No	No	No

As nouns, posting is a hypernym of show bill; that is, posting is a word with a broader meaning than show bill:

Other hypernyms of show bill include bill, card, notice, placard, poster.

show bill (noun)	posting (noun)
a poster advertising a show or play	the transmission of a letter
	a sign posted in a public place as an advertisement
	(bookkeeping) a listing on the company's records