化石燃料[kasekinenryou] fossil fuel
可燃[kanen] inflammable
可燃性[kanensei] combustibility
可燃物[kanenbutsu] combustibles
核燃料[kakunenryou] atomic fuel

再燃[sainen] recurrence
代燃車[dainensha] car running on substitute fuel
内燃機関[nainenkikan] internal-combustion engine
燃える[moeru] to burn
燃え移る[moeutsuru] (of fire) to spread

維持費[ijihi] maintenance costs
運動費[undouhi] campaign fund
加工費[kakouhi] processing cost
会費[kaihi] membership fee
学費[gakuhi] tuition

官費[kanpi] government expense
巨費[kyohi] great cost
共益費[kyouekihi] monthly fee for common areas of an apartment building (lighting, etc.)
教材費[kyouzaihi] teaching material fees
区費[kuhi] ward expenses