御食い初め[okuizome] weaning ceremony
為初め[shisome] outset
為初める[shisomeru] to begin to do
仮初[karisome] temporary
業界初[gyoukaihatsu] the industry's first ...

月初め[tsukihajime] beginning of month
最初[saisho] beginning
初めに[hajimeni] to begin with (used as an introduction)
初めは[hajimeha] at first
手初めに[tehajimeni] at first

一旬[ichijun] ten days
下旬[gejun] month (last third of)
五旬節[gojunsetsu] pentecost
旬外れ[junhazure] off-season

旬刊[junkan] published every ten days
旬月[jungetsu] month and ten days
旬日[junjitsu] ten-day period
旬報[junpou] ten-day report