
1) Advertising medium 2) Construction 3) Marker 4) Notice 5) One place for advertising 6) Road sign 7) Sign 8) Structure
Found on
https://www.crosswordclues.com/clue/signboard

1) Billboard 2) Hoarding
Found on
https://www.crosswordclues.com/clue/signboard

• (n.) A board, placed on or before a shop, office, etc., on which ssome notice is given, as the name of a firm, of a business, or the like.
Found on
http://thinkexist.com/dictionary/meaning/signboard/
Sign'board` noun A board, placed on or before a shop, office, etc., on which ssome notice is given, as the name of a firm, of a business, or the like.
Found on
http://www.encyclo.co.uk/webster/S/101

[
n] - structure displaying a board on which advertisements can be posted
Found on
http://www.webdictionary.co.uk/definition.php?query=signboard
noun structure displaying a board on which advertisements can be posted; `the highway was lined with signboards`
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.