いい年をして[iitoshiwoshite] (in spite of) being old enough to know better
亥年[idoshi] year of the boar
一箇年[ikkanen] one year
一周年[isshuunen] one full year
一年以内に[ichineninaini] within a year

一年間[ichinenkan] (period of) one year
一年生[ichinensei] annual (plant)
一年草[ichinensou] annual (plant)
一年ぢゅう[ichinenjuu] all year round
一両年[ichiryounen] (a) year or two

西貢[saigon] Saigon
貢ぎ[mitsugi] tribute
貢ぐ[mitsugu] to support
貢献[kouken] contribution (furthering a goal or cause)
入貢[nyuukou] paying tribute

年貢[nengu] annual tribute
年貢米[nengumai] annual rice tax
来貢[raikou] coming to pay tribute
貢物[mitsugimono] tribute
朝貢[choukou] bringing tribute