-yotl.

With organic possession, or inalienable possession, we can see the difference between nonac (my meat, as in, on my plate) and nonacayo (my body, or my flesh, a common testamentary term), or between īezhui (its blood, perhaps the meal of a blood-drinking beast) and īezzo (his blood, flowing through a person's veins).
Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 99.

With capes of various designs, the -yo ending refers to the design. e.g. axayacayo = cape with water-face design; tlachquauhyo tilmatli = cape with ball court design; tonatiuhyo tilmatli = cape with sun design.
Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan, et al. (Norman: University of Oklahoma Press, 1997), 204.

An abstract; can also mean "something that belongs, or is an inherent part, of something else; a noun with '-yotl' not possessed is merely a statement that something has that thing."
teotl = God, teoyotl = divinity
tecuio = lordship
nocal yhuan tlalmayo = my house and the level land that goes with it (tlalmantli + yotl)
Stephanie Wood and Robert Haskett's notes from seminars with James Lockhart.

-yoc (from -yotl; the -c is a locative; still means the same, like -ness or -ship in English)
Rebecca Horn's notes from Nahuatl classes with James Lockhart. Card file in possession of Stephanie Wood.

tenancayotl = to have the quality of affairs having to do with the Tenanca (people of Tenanco) or Tenancatl (person of Tenanco)
Rebecca Horn's notes from Nahuatl classes with James Lockhart. Card file in possession of Stephanie Wood.

-otl (e.g., after a final z, the y will drop away -- mahuitzotl, having the quality of honor, honor, reverence)
Rebecca Horn's notes from Nahuatl classes with James Lockhart. Card file in possession of Stephanie Wood.