Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
adjūmentum, i, n. [a contraction of adjuvamentum, from adjuvo], a means of aid; help, aid, assistance, support (class.): nihil aderat (in illa puella) adjumenti ad pulchritudinem, Ter. Phorm. 1, 2, 55: esse alicui magno adjumento ad victoriam, Cic. Brut. 1, 4: Quam ad rem magnum attulimus adjumentum hominibus nostris, id. Off. 1, 1: adjumenta et subsidia consulatūs, id. Mur. 18: adjumenta salutis, id. Sen. 27: multis aliis adjumentis petitionis ornatus, id. Mur. 53: mihi honoribus, id. Imp. Pomp. 24; id. Fin. 5, 21; id. Fam. 13, 30; Sall. J. 45, 2; Quint. prooem. § 27; Ov. P. 4, 13, 31 al.