WordNet sense 1 (climber having dark red berries (peppercorns) when fully ripe; southern India and Sri Lanka; naturalized in northern Burma and Assam):

black pepper, white pepper, common pepper, Madagascar pepper, Piper nigrum

WordNet sense 2 (any of various tropical plants of the genus Capsicum bearing peppers):

capsicum, capsicum pepper plant

WordNet sense 3 (pungent seasoning from the berry of the common pepper plant of East India; use whole or ground):

peppercorn

WordNet sense 4 (attack and bombard with or as if with missiles):

pelt