１月[ichigatsu] January
ひと月[ichigetsu] one month
下弦の月[kagennotsuki] waning moon
何ヶ月[nankagetsu] how many months?
何月[nangatsu] what month

佳月[kagetsu] good month
か月[kagetsu] (number of) months
花鳥風月[kachoufuugetsu] beauties of nature
各月[kakugetsu] every month
隔月[kakugetsu] every second month

アーク灯[aakutou] arc light
灯影[hokage] firelight
懐中電灯[kaichuudentou] electric torch
外灯[gaitou] outside light
街灯[gaitou] street light

幻灯[gentou] slide projector
行灯[andon] fixed paper-enclosed lantern
信号灯[shingoutou] signal light
石灯籠[ishitourou] stone lantern
船灯[sentou] ship's lamp