Although _-tus_ is also usually considered as forming nomina actionis, the example of cruciatus clearly is parallel with that of cruciamentum: _confectus_ iam cruciatu maximorum _dolorum_, ne id quidem scribere possim, quod...., Att. XI. 11, 1; nec _graviora_ sunt tormenta carnificum, quam interdum cruciamenta _morborum_, Phil. 11, 4. Calceamentum, “shoe” or covering for the feet, has two accessory forms, calceamen and calceatus, which are synonymous with it (the former being found only in Pliny): mihi est calciamentum _solorum callum_, amictui Scythicum tegimen, T. 5, 90; _vestitu_ calceatuque et cetero habitu neque patrio neque civili usus est, Suet. Calig. 52; hinc [_sparto_] strata rusticis eorum, hinc ignes facesque, hinc calceamina et pastorum _vestis_, Plin. 19, 2, 7. The use of _ad_ and a gerund after both invitatio and invitamenta indicate their lack of difference in meaning in these two instances: ad eundem fontem revertendum est, _aegritudinem omnem abesse_ a sapiente, quod inanis sit, quod frustra suscipiatur, quod non natura exoriatur, sed iudicio, sed opinione sed quadam invitatione _ad dolendum_, cum id decreverimus ita fieri oportere, T. 3, 82; quocirca intellegi necesse est in ipsis rebus, quae discuntur et cognoscuntur, invitamenta inesse, quibus _ad discendum_ cognoscendumque moveamur, F. 5, 52. Munitio is another _-tio_ noun that ordinarily has verbal force, but not at all infrequently it coincides in meaning with both munimen and munimentum: cum urbem _operibus_ munitionibusque saepsisset, Phil. 13, 9, 20; _castella_ et munitiones idoneis locis imponens, Tac. A. 3, 74. The genitives following munimen and munitio are alike in meaning and function, both being appositional: confisus munitione _fossae_, B. C. 1, 42, 3; narrat esse locum solidae tectum munimine _molis_, Ov. M. 4, 771. Munimentum is used of the same kind of “fortification”: _fossa_, haud parvum munimentum, Liv. 1, 33, 7. Natura and ignis are the similar elements in the following contexts that indicate the identity in meaning between nutrimen and nutrimentum: nempe ubi terra cibos alimentaque pinguia flammae non dabit absumptis per longum viribus aevum _naturaeque_ suum nutrimen deerit edaci, Ov. M. 15, 354; suscepit _ignem_ foliis atque arida circum nutrimenta dedit, Aen. 1, 176. In the first example, curiously enough, nutrimen seems to be also synonymous with alimenta in the second line before it. Nato and puerorum following oblectamina and oblectamenta indicate identity in meaning, although the latter is still vague, while the former is specified by “flores”: carpserat _flores_, quos oblectamina _nato_ porrigeret, Ov. M. 9, 342; obsecro te non ut vincla virorum sint, sed ut oblectamenta _puerorum_, Par. 5, 2, 38.