伍つ[itsutsu] five
伍長[gochou] corporal
卒伍[sotsugo] rank and file
落伍[rakugo] dropping out of
落伍者[rakugosha] dropout

隊伍[taigo] ranks of troops
伍を重ねる[gowokasaneru] to double the ranks
先頭伍[sentougo] leading file
伍する[gosuru] to rank with

落っこちる[okkochiru] to fall down
お洒落[oshare] smartly dressed
ぽたぽた落ちる[potapotaochiru] to fall in drops
悪洒落[warujare] offensive joke
為落し[shiotoshi] omission

為落ち[shiochi] omission
為落す[shiotosu] to fail to do
一段落[ichidanraku] completing the first stage
猿も木から落ちる[sarumokikaraochiru] even monkeys fall from trees
下落[geraku] depreciation