Nouns

(n)acerate leaf, needlethe leaf of a conifer
(n)needlea slender pointer for indicating the reading on the scale of a measuring instrument
(n)needlea sharp pointed implement (usually steel)
(n)phonograph needle, needlea stylus that formerly made sound by following a groove in a phonograph record

Verbs

(v)needle, goadannoy or provoke, as by constant criticism“He needled her with his sarcastic remarks”
(v)needleprick with a needle