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

月遅れ[tsukiokure] a month or older
遅れをとる[okurewotoru] to fall behind
今や遅しと[imayaososhito] impatiently
手遅れ[teokure] being (too) late
出し遅れ[dashiokure] belated

出遅れる[deokureru] to get a late start
乗り遅れる[noriokureru] to miss (train, bus, etc.)
申し遅れる[moushiokureru] to be slow in saying
足が遅い[ashigaosoi] to be slow-footed
遅い[osoi] slow