Y

a captain of soldiers (see Molina)

the job or duty of a captain in war (see Molina)

to make war, to go to battle to conquer (see attestations)

to captain in war; or, to order the squadrons to do battle (see Molina)

to contend with someone, or to make enemies with someone (see Molina); to fight, to make war on someone (see attestations)

enemy; in compounds (-yao-), refers to war, hostilities, battle(s); when a personal name, translates "combatant;" and, a deity's name, part of the Tezcatlipoca Complex of deities that relate to power, omnipotence, often malevolence, feasting, and revelry.
"Table 3. Major Deities of the Late Pre-Hispanic Central Mexican Nahua-Speaking Communities," Handbook of Middle American Indians, Volume 6: Social Anthropology, ed Manning Nash (Austin: University of Texas Press, 1967).

warriors (see attestations); singular: yaotlacatl

the act of overlooking and observing the country or seacoast from a watchtower (see Molina)

a person's name (gender not made clear)