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

逢瀬[ouse] rendezvous
やる瀬ない[yarusenai] helpless
瀬戸[seto] strait
瀬戸際[setogiwa] brink
瀬戸内海[setonaikai] Inland Sea

瀬戸物[setomono] earthenware
瀬戸物市[setomonoichi] ceramic market
浅瀬[asase] shoal
早瀬[hayase] swift current