Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
per-nŭmĕro, āvi, ātum, 1, v. a., to count out, reckon up: argentum, Plaut. Ep. 5, 1, 25: pecuniam, Liv. 28, 34 fin.: opes, Mart. 12, 62, 12: res hereditarias, Dig. 37, 9, 1, § 24.