Allen and Greenough's New Latin Grammar for Schools and Colleges
J. B. Greenough, G. L. Kittredge, A. A. Howard, Benj. L. D'Ooge, Ed.

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[*] 255. The suffix -ō (genitive -ōnis, stem ōn-), usually added to verb-stems (see § 236. c), is sometimes used with noun-stems to form nouns denoting possessed of. These were originally adjectives expressing quality or character, and hence often appear as proper names:—

1. epulae, a feast; epul-ō, a feaster.
2. nāsus, a nose; nās-ō, with a large nose (also as a proper name).
3. volus (in bene-volus ), wishing; vol-ōnēs (plural), volunteers.
4. frōns, forehead; front-ō, big-head (also as a proper name).
5. cūria, a curia; cūri-ō, head of a curia (also as a proper name).
6. restis, a rope; resti-ō, a rope-maker.

[*] a. Rarely suffixes are added to compound stems imagined, but not used in their compound form:—

1. ad-verb-ium, adverb; ad, to, and verbum, verb, but without the intervening †adverbus.
2. lāti-fund-ium, large estate; lātus, wide, fundus, estate, but without the inter vening †lātifundus.
3. su-ove-taur-īlia, a sacrifice of a swine, a sheep, and a bull; sūs, swine, ovis, sheep, taurus, bull, where the primitive would be impossible in Latin, though such formations are common in Sanskrit.