"placards" in the noun sense
1. poster, posting, placard, notice, bill, card
a sign posted in a public place as an advertisement
"a poster advertised the coming attractions"
"placards" in the verb sense
1. placard
post in a public place
2. placard, bill
publicize or announce by placards
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License