A Billhook

1. (weaponry) A medieval polearm, fitted to a long handle, sometimes with an L-shaped tine or a spike protruding from the side or the end of the blade for tackling the opponent; a bill Billhook - Wikipedia
2. An agricultural implement often with a curved or hooked end to the blade used for pruning or cutting thick, woody plants.
3. Written as bill-hook: a part of the knotting mechanism in a reaper-binder or baler (agricultural machinery).
4. Written as bill hook: a spiked hook used in offices and shops for hanging bills or other small papers such as receipts.
5. (ornithology) Written as bill hook: a sharply pointed spike growing from the tip of the upper mandible of the hatchlings of honeyguides, used to destroy the eggs and kill the chicks of the host species.

Synonyms

• handbill, pruning hook, hack, hacker, hedging bill, hedging-bill, hedge bill, bill, broom hook, block hook, Yorkshire bill, vine hook