Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
praecentor, ōris, m. [praecino], a leader in music, precentor (post-class.): praecentor in choris, App. Mund. p. 74, 3; cf.: praecentor qui vocem praemittit (opp. succentor), Aug. Enarr. in Psa. 87; cf. Isid. 7, 12, 27.