本の[honno] mere
異本[ihon] different edition
一坪本社[hitotsubohonsha] small company headquarters located in Tokyo simply for name value
一本[ippon] one long cylindrical thing
一本気[ippongi] single-minded (esp. personality or person)

一本橋[ipponbashi] (a) log bridge
一本建て[ippondate] (a) single standard
一本松[ipponmatsu] solitary pine tree
一本杉[ipponsugi] (a) solitary cryptomeria tree
一本槍[ipponyari] guiding principle

鮪釣り[magurotsuri] tuna fishing
梶木鮪[kajikimaguro] marlin
黒鮪[kuromaguro] Pacific bluefin tuna (edible fish, Thunnus orientalis)
鮪女[maguroonna] woman who lies flat during intercourse
葱鮪[negima] dishes based on spring onions and tuna

本鮪[honmaguro] Pacific bluefin tuna (edible fish, Thunnus orientalis)
黄肌鮪[kihadamaguro] yellowfin tuna (Thunnus albacares)
大西洋黒鮪[taiseiyoukuromaguro] northern bluefin tuna (Thunnus thynnus)
葱鮪鍋[negimanabe] stew based on spring onions and tuna